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rijaeger(at)wausau.k12.wi
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 Posted: Tue Nov 22, 2011 5:43 am Post subject: Yak 52 Questions... |
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Hey, Guys!
1) Where exactly are jacks placed under a Yak for retraction tests?
2) How much of a charge will the pneumatic system require for multiple retraction cycles?
There'll be more, but for now...HAPPY HOLIDAYS!!
...and THANK YOU!
Rico
[quote][b]
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dsavarese0812(at)bellsout
Guest
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| Posted: Tue Nov 22, 2011 6:36 am Post subject: Yak 52 Questions... |
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|
You have to have jack points to screw into the wings (behind the main
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
| Quote: | Hey, Guys!
1) Where exactly are jacks placed under a Yak for retraction tests?
2) How much of a charge will the pneumatic system require for multiple
retraction cycles?
There'll be more, but for now...HAPPY HOLIDAYS!!
...and THANK YOU!
Rico
*
*
|
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mark.bitterlich(at)navy.m
Guest
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| Posted: Tue Nov 22, 2011 7:10 am Post subject: Yak 52 Questions... |
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One additional comment:
The threaded bolts that go into these jack points are exactly the same as those used on old Volkswagon wheels. A old trick that was passed on to me long ago.
Mark Bitterlich
________________________________
From: owner-yak-list-server(at)matronics.com on behalf of A. Dennis Savarese
Sent: Tue 11/22/2011 9:33 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
You have to have jack points to screw into the wings (behind the main
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
| Quote: | Hey, Guys!
1) Where exactly are jacks placed under a Yak for retraction tests?
2) How much of a charge will the pneumatic system require for multiple
retraction cycles?
There'll be more, but for now...HAPPY HOLIDAYS!!
...and THANK YOU!
Rico
*
*
|
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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rijaeger(at)wausau.k12.wi
Guest
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| Posted: Tue Nov 22, 2011 7:23 am Post subject: Yak 52 Questions... |
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|
OK. Roger all that. Is a "hard retract" undesirable or potentially damaging? How much air pressure will I need to do the initial retractions?
| Quote: | >> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> 11/22/2011 8:33 AM >>>
You have to have jack points to screw into the wings (behind the main
|
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
| Quote: | Hey, Guys!
1) Where exactly are jacks placed under a Yak for retraction tests?
2) How much of a charge will the pneumatic system require for multiple
retraction cycles?
There'll be more, but for now...HAPPY HOLIDAYS!!
...and THANK YOU!
Rico
*
*
|
[quote][b]
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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dsavarese0812(at)bellsout
Guest
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| Posted: Tue Nov 22, 2011 7:43 am Post subject: Yak 52 Questions... |
|
|
More undesirable than damaging because it shakes the heck out of the
airplane while on the jacks. Air pressure? I think I already answered
that. On an average of all 52's a minimum of 25 ATM's will be needed
for any retraction.
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 9:20 AM, Rico Jaeger wrote:
| Quote: | OK. Roger all that. Is a "hard retract" undesirable or potentially
damaging? How much air pressure will I need to do the initial retractions?
>>> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> 11/22/2011 8:33
AM >>>
You have to have jack points to screw into the wings (behind the main
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
> Hey, Guys!
> 1) Where exactly are jacks placed under a Yak for retraction tests?
> 2) How much of a charge will the pneumatic system require for multiple
> retraction cycles?
> There'll be more, but for now...HAPPY HOLIDAYS!!
> ...and THANK YOU!
> Rico
> *
>
>
> *
*
*
|
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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dsavarese0812(at)bellsout
Guest
|
| Posted: Tue Nov 22, 2011 7:46 am Post subject: Yak 52 Questions... |
|
|
Good point Mark. I've gone to the local Yak-Autozone or Yak-Advance
Auto Parts store or NAPA (National Aircraft Parts Association) store and
bought non-vehicle specific 14 mm wheel lugs and wheel nuts and made
jack points from them.
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 9:04 AM, Bitterlich, Mark G CIV Det Cherry Point, MALS-14
64E wrote:
| Quote: |
One additional comment:
The threaded bolts that go into these jack points are exactly the same as those used on old Volkswagon wheels. A old trick that was passed on to me long ago.
Mark Bitterlich
________________________________
From: owner-yak-list-server(at)matronics.com on behalf of A. Dennis Savarese
Sent: Tue 11/22/2011 9:33 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
You have to have jack points to screw into the wings (behind the main
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
> Hey, Guys!
> 1) Where exactly are jacks placed under a Yak for retraction tests?
> 2) How much of a charge will the pneumatic system require for multiple
> retraction cycles?
> There'll be more, but for now...HAPPY HOLIDAYS!!
> ...and THANK YOU!
> Rico
> *
> *
|
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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viperdoc(at)mindspring.co
Guest
|
| Posted: Tue Nov 22, 2011 7:54 am Post subject: Yak 52 Questions... |
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|
? #1 – yes
? #2 – start with 55 atm (x 10) of course.
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Rico Jaeger
Sent: Tuesday, November 22, 2011 9:21 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
OK. Roger all that. Is a "hard retract" undesirable or potentially damaging? How much air pressure will I need to do the initial retractions?
| Quote: | >> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> 11/22/2011 8:33 AM >>>
You have to have jack points to screw into the wings (behind the main
|
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
| Quote: | Hey, Guys!
1) Where exactly are jacks placed under a Yak for retraction tests?
2) How much of a charge will the pneumatic system require for multiple
retraction cycles?
There'll be more, but for now...HAPPY HOLIDAYS!!
...and THANK YOU!
Rico
*
*
01234567890123456789012
|
[quote][b]
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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rijaeger(at)wausau.k12.wi
Guest
|
| Posted: Tue Nov 22, 2011 8:07 am Post subject: Yak 52 Questions... |
|
|
OK, being a complete novice here...I have no idea what "25 atmospheres" is. Will I know how to achieve that when I hook up a welding oxygen tank to the system? I've only dealt w/ PSI. Thank you - and so sorry for the naive questions.
| Quote: | >> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> 11/22/2011 9:41 AM >>>
--> Yak-List message posted by: "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net>
|
More undesirable than damaging because it shakes the heck out of the
airplane while on the jacks. Air pressure? I think I already answered
that. On an average of all 52's a minimum of 25 ATM's will be needed
for any retraction.
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 9:20 AM, Rico Jaeger wrote:
| Quote: | OK. Roger all that. Is a "hard retract" undesirable or potentially
damaging? How much air pressure will I need to do the initial retractions?
>>> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> 11/22/2011 8:33
AM >>>
You have to have jack points to screw into the wings (behind the main
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
> Hey, Guys!
> 1) Where exactly are jacks placed under a Yak for retraction tests?
> 2) How much of a charge will the pneumatic system require for multiple
> retraction cycles?
> There'll be more, but for now...HAPPY HOLIDAYS!!
> ...and THANK YOU!
> Rico
> *
>
>
-= November is the Annual List Fund Raiser. Click href="http://www.matronics.com/contribution">http://www.matronics.com/connbsp; -Matt Dralle, List sp; - The Yak-List Email Forum matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-Lisp; - -Matt =========
|
[quote][b]
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mark.bitterlich(at)navy.m
Guest
|
| Posted: Tue Nov 22, 2011 8:12 am Post subject: Yak 52 Questions... |
|
|
A warning and explantion concerning test emergency gear blowdown is also probably in order right now, just in case he, or anyone else decides to just "try it out" while on jacks. Also procedures to reset it. Just a thought.
Mark
________________________________
From: owner-yak-list-server(at)matronics.com on behalf of A. Dennis Savarese
Sent: Tue 11/22/2011 10:41 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
More undesirable than damaging because it shakes the heck out of the
airplane while on the jacks. Air pressure? I think I already answered
that. On an average of all 52's a minimum of 25 ATM's will be needed
for any retraction.
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 9:20 AM, Rico Jaeger wrote:
| Quote: | OK. Roger all that. Is a "hard retract" undesirable or potentially
damaging? How much air pressure will I need to do the initial retractions?
>>> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> 11/22/2011 8:33
AM >>>
You have to have jack points to screw into the wings (behind the main
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
> Hey, Guys!
> 1) Where exactly are jacks placed under a Yak for retraction tests?
> 2) How much of a charge will the pneumatic system require for multiple
> retraction cycles?
> There'll be more, but for now...HAPPY HOLIDAYS!!
> ...and THANK YOU!
> Rico
> *
>
>
> *
*
*
|
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richard.goode(at)russiana
Guest
|
| Posted: Tue Nov 22, 2011 8:16 am Post subject: Yak 52 Questions... |
|
|
55 atm x 10 would be interesting!!
Richard
Richard Goode
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Roger Kemp MD
Sent: 22 November 2011 15:52
To: yak-list(at)matronics.com
Subject: RE: Yak 52 Questions...
? #1 – yes
? #2 – start with 55 atm (x 10) of course.
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Rico Jaeger
Sent: Tuesday, November 22, 2011 9:21 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
OK. Roger all that. Is a "hard retract" undesirable or potentially damaging? How much air pressure will I need to do the initial retractions?
| Quote: | >> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> 11/22/2011 8:33 AM >>>
You have to have jack points to screw into the wings (behind the main
|
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
| Quote: | Hey, Guys!
1) Where exactly are jacks placed under a Yak for retraction tests?
2) How much of a charge will the pneumatic system require for multiple
retraction cycles?
There'll be more, but for now...HAPPY HOLIDAYS!!
...and THANK YOU!
Rico
*
*
| Quote: | | www.aeroelectric.comwww.buildersbooks.comwww.homebuilthelp.comhttp://www.matronics.com/contribution http://www.matronics.com/Navigator?Yak-List |
012345
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mark.bitterlich(at)navy.m
Guest
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| Posted: Tue Nov 22, 2011 8:21 am Post subject: Yak 52 Questions... |
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|
The normal air pressure for the system is 735 PSI which equates to 50 atmospheres. Some debate here on nitpicking bars and atmospheres that I will avoid. You have a gage in your cockpit which reads the normal bottle on the left and the emergency bottle pressure on the right. It reads in single digits, like 1-7, and you multiply that by 10 to get the actual reading. So when it reads 5, that means 50 which means 50 atmospheres, which means .... 735 PSI.
Dennis has warned you not to run the bottle down to extremely low pressures because if you do that, and then EXTEND the gear, it will come down fast and hard, which is not the end of the world, but it is also not a really GOOD thing. So, if you have the external air bottle connected, just use it to keep the pressure gage in the cockpit reading between say 3-5. Be careful to fill the bottle in the aircraft SLOWLY. So not just open everything wide open and let er rip. Not good for a number of components, so avoid that.
Emergency blow-down is a whole different subject.
Mark
________________________________
From: owner-yak-list-server(at)matronics.com on behalf of Rico Jaeger
Sent: Tue 11/22/2011 11:04 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
OK, being a complete novice here...I have no idea what "25 atmospheres" is. Will I know how to achieve that when I hook up a welding oxygen tank to the system? I've only dealt w/ PSI. Thank you - and so sorry for the naive questions.
| Quote: | >> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> 11/22/2011 9:41 AM >>>
|
More undesirable than damaging because it shakes the heck out of the
airplane while on the jacks. Air pressure? I think I already answered
that. On an average of all 52's a minimum of 25 ATM's will be needed
for any retraction.
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 9:20 AM, Rico Jaeger wrote:
| Quote: | OK. Roger all that. Is a "hard retract" undesirable or potentially
damaging? How much air pressure will I need to do the initial retractions?
>>> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> 11/22/2011 8:33
AM >>>
You have to have jack points to screw into the wings (behind the main
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
> Hey, Guys!
> 1) Where exactly are jacks placed under a Yak for retraction tests?
> 2) How much of a charge will the pneumatic system require for multiple
> retraction cycles?
> There'll be more, but for now...HAPPY HOLIDAYS!!
> ...and THANK YOU!
> Rico
> *
>
>
-= November is the Annual List Fund Raiser. Click href="http://www.matronics.com/contribution">http://www.matronics.com/connbsp; -Matt Dralle, List sp; - The Yak-List Email Forum matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-Lisp; - -Matt =========
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brian(at)lloyd.com
Guest
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| Posted: Tue Nov 22, 2011 8:21 am Post subject: Yak 52 Questions... |
|
|
On Tue, Nov 22, 2011 at 8:04 AM, Rico Jaeger <rijaeger(at)wausau.k12.wi.us (rijaeger(at)wausau.k12.wi.us)> wrote:
| Quote: | OK, being a complete novice here...I have no idea what "25 atmospheres" is. Will I know how to achieve that when I hook up a welding oxygen tank to the system? I've only dealt w/ PSI. Thank you - and so sorry for the naive questions.
|
NO NO NO NO NO NO NO NO NO NO NO NO !!!!!!!!!!!!!!!!!!
DO NOT USE OXYGEN!!!!!!!!!!!!!!!!!!!!!!
IF YOU USE O2 YOU COULD IGNITE THE OIL IN THE LINES!!!!!!!!
Normally one uses compressed air from a SCUBA tank. If that isn't convenient you can use N2 (nitrogen). N2 is totally safe and eliminates any chance of fire but can (under some conditions) make your engine hard to start.
As for atmospheres, PSI, and kilograms force per square centimeter (kgf/cm^2) here is the skinny:
- The stock gauges read out in kgf/cm^2.
- 1 kgf/cm^2 is very close to one atmosphere, enough so that, in this case you can use them interchangeably.
- 1 atmosphere = 15psi.
- 50 kgf/cm^2 is approximately equal to 750psi.
Hopefully this helps.
I am beginning to get the feeling that you might want to find someone to help you who has a bit more experience.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian(at)lloyd.com (brian(at)lloyd.com)
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
[quote][b]
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mark.bitterlich(at)navy.m
Guest
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| Posted: Tue Nov 22, 2011 8:27 am Post subject: Yak 52 Questions... |
|
|
Over 8 THOUSAND PSI.
Kind of makes you wonder how he prescribes drugs to patients doesn't it?
NURSE, THIS MAN NEED 5 UNITS OF BLOOD. Times 10 of course! Sigh.....
Mark
________________________________
From: owner-yak-list-server(at)matronics.com on behalf of Richard Goode
Sent: Tue 11/22/2011 11:13 AM
To: yak-list(at)matronics.com
Subject: RE: Yak 52 Questions...
55 atm x 10 would be interesting!!
Richard
Richard Goode
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Roger Kemp MD
Sent: 22 November 2011 15:52
To: yak-list(at)matronics.com
Subject: RE: Yak 52 Questions...
? #1 - yes
? #2 - start with 55 atm (x 10) of course.
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Rico Jaeger
Sent: Tuesday, November 22, 2011 9:21 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
OK. Roger all that. Is a "hard retract" undesirable or potentially damaging? How much air pressure will I need to do the initial retractions?
| Quote: | >> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> 11/22/2011 8:33 AM >>>
You have to have jack points to screw into the wings (behind the main
|
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com <http://www.yak-52.com/>
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
| Quote: | Hey, Guys!
1) Where exactly are jacks placed under a Yak for retraction tests?
2) How much of a charge will the pneumatic system require for multiple
retraction cycles?
There'll be more, but for now...HAPPY HOLIDAYS!!
...and THANK YOU!
Rico
*
*
|
www.aeroelectric.com
www.buildersbooks.com <http://www.buildersbooks.com/>
www.homebuilthelp.com
http://www.matronics.com/contribution
http://www.matronics.com/Navigator?Yak-List
http://forums.matronics.com
http://www.matronics.com/contribution
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tigeryak18t
Joined: 26 Sep 2009
Posts: 233
Location: PARIS FRANCE
|
| Posted: Tue Nov 22, 2011 8:33 am Post subject: Yak 52 Questions... |
|
|
NEVER USE OXYGEN IN THE AIR LINES.
There has been accidents using oxygen.
Scuba air is perfectly fine.
N2 is luxury
I tested retractation and air start with 15 bars and it works...but one chance...not two !!!
Best regards
2011/11/22 Brian Lloyd <brian(at)lloyd.com (brian(at)lloyd.com)>
| Quote: |
On Tue, Nov 22, 2011 at 8:04 AM, Rico Jaeger <rijaeger(at)wausau.k12.wi.us (rijaeger(at)wausau.k12.wi.us)> wrote:
| Quote: | OK, being a complete novice here...I have no idea what "25 atmospheres" is. Will I know how to achieve that when I hook up a welding oxygen tank to the system? I've only dealt w/ PSI. Thank you - and so sorry for the naive questions.
|
NO NO NO NO NO NO NO NO NO NO NO NO !!!!!!!!!!!!!!!!!!
DO NOT USE OXYGEN!!!!!!!!!!!!!!!!!!!!!!
IF YOU USE O2 YOU COULD IGNITE THE OIL IN THE LINES!!!!!!!!
Normally one uses compressed air from a SCUBA tank. If that isn't convenient you can use N2 (nitrogen). N2 is totally safe and eliminates any chance of fire but can (under some conditions) make your engine hard to start.
As for atmospheres, PSI, and kilograms force per square centimeter (kgf/cm^2) here is the skinny:
- The stock gauges read out in kgf/cm^2.
- 1 kgf/cm^2 is very close to one atmosphere, enough so that, in this case you can use them interchangeably.
- 1 atmosphere = 15psi.
- 50 kgf/cm^2 is approximately equal to 750psi.
Hopefully this helps.
I am beginning to get the feeling that you might want to find someone to help you who has a bit more experience.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian(at)lloyd.com (brian(at)lloyd.com)
[url=tel:%2B1.767.617.1365]+1.767.617.1365[/url] (Dominica)
[url=tel:%2B1.916.877.5067]+1.916.877.5067[/url] (USA)
| Quote: |
_blank">www.aeroelectric.com
.com" target="_blank">www.buildersbooks.com
="_blank">www.homebuilthelp.com
_blank">http://www.matronics.com/contribution
et="_blank">http://www.matronics.com/Navigator?Yak-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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Email: didier.blouzard(at)gmail.com (didier.blouzard(at)anolistech.fr)
[quote][b]
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dandmaz(at)cox.net
Guest
|
| Posted: Tue Nov 22, 2011 8:40 am Post subject: Yak 52 Questions... |
|
|
Thank God you monitor the Yak list, Brian thank you.
Don Andrews
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Brian Lloyd
Sent: Tuesday, November 22, 2011 9:20 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
On Tue, Nov 22, 2011 at 8:04 AM, Rico Jaeger <rijaeger(at)wausau.k12.wi.us (rijaeger(at)wausau.k12.wi.us)> wrote:
OK, being a complete novice here...I have no idea what "25 atmospheres" is. Will I know how to achieve that when I hook up a welding oxygen tank to the system? I've only dealt w/ PSI. Thank you - and so sorry for the naive questions.
NO NO NO NO NO NO NO NO NO NO NO NO !!!!!!!!!!!!!!!!!!
DO NOT USE OXYGEN!!!!!!!!!!!!!!!!!!!!!!
IF YOU USE O2 YOU COULD IGNITE THE OIL IN THE LINES!!!!!!!!
Normally one uses compressed air from a SCUBA tank. If that isn't convenient you can use N2 (nitrogen). N2 is totally safe and eliminates any chance of fire but can (under some conditions) make your engine hard to start.
As for atmospheres, PSI, and kilograms force per square centimeter (kgf/cm^2) here is the skinny:
- The stock gauges read out in kgf/cm^2.
- 1 kgf/cm^2 is very close to one atmosphere, enough so that, in this case you can use them interchangeably.
- 1 atmosphere = 15psi.
- 50 kgf/cm^2 is approximately equal to 750psi.
Hopefully this helps.
I am beginning to get the feeling that you might want to find someone to help you who has a bit more experience.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian(at)lloyd.com (brian(at)lloyd.com)
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA) 0123456789012345678901234
[quote][b]
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viperdoc(at)mindspring.co
Guest
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| Posted: Tue Nov 22, 2011 8:52 am Post subject: Yak 52 Questions... |
|
|
DO NOT PUT OXYGEN in the air system! UNLESS YOU WANT TO BE BLOWN UP IN A Literal SINCE when you first start the plane!. Use compressed air only. Nitrogen will work but will in most instances not start your engine when you get to that point.
NO OXYGEN in the AIR TANKS! YOUR LIFE DEPENDS ON IT!
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Rico Jaeger
Sent: Tuesday, November 22, 2011 10:04 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
OK, being a complete novice here...I have no idea what "25 atmospheres" is. Will I know how to achieve that when I hook up a welding oxygen tank to the system? I've only dealt w/ PSI. Thank you - and so sorry for the naive questions.
More undesirable than damaging because it shakes the heck out of the
airplane while on the jacks. Air pressure? I think I already answered
that. On an average of all 52's a minimum of 25 ATM's will be needed
for any retraction.
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 9:20 AM, Rico Jaeger wrote:
| Quote: | OK. Roger all that. Is a "hard retract" undesirable or potentially
damaging? How much air pressure will I need to do the initial retractions?
>>> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> 11/22/2011 8:33
AM >>>
You have to have jack points to screw into the wings (behind the main
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
> Hey, Guys!
> 1) Where exactly are jacks placed under a Yak for retraction tests?
> 2) How much of a charge will the pneumatic system require for multiple
> retraction cycles?
> There'll be more, but for now...HAPPY HOLIDAYS!!
> ...and THANK YOU!
> Rico
> *
>
>
-= November is the Annual List Fund Raiser. Click href="http://www.matronics.com/contribution">http://www.matronics.com/connbsp; -Matt Dralle, List sp; - The Yak-List Email Forum matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-Lisp; - -Matt =========
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[quote][b]
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viperdoc(at)mindspring.co
Guest
|
| Posted: Tue Nov 22, 2011 8:54 am Post subject: Yak 52 Questions... |
|
|
I stand corrected. Meant 5.5 ATM X 10. Missed the decimal point!
The air gauge on the left lower side of the instrument panel is you air pressure gauge. It is labeled in atmospheres (ATM).
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Richard Goode
Sent: Tuesday, November 22, 2011 10:14 AM
To: yak-list(at)matronics.com
Subject: RE: Yak 52 Questions...
55 atm x 10 would be interesting!!
Richard
Richard Goode
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com] ([email][mailto:owner-yak-list-server(at)matronics.com][/email]) On Behalf Of Roger Kemp MD
Sent: 22 November 2011 15:52
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: RE: Yak 52 Questions...
? #1 – yes
? #2 – start with 55 atm (x 10) of course.
Doc
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com] ([email][mailto:owner-yak-list-server(at)matronics.com][/email]) On Behalf Of Rico Jaeger
Sent: Tuesday, November 22, 2011 9:21 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Yak 52 Questions...
OK. Roger all that. Is a "hard retract" undesirable or potentially damaging? How much air pressure will I need to do the initial retractions?
| Quote: | >> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> 11/22/2011 8:33 AM >>>
You have to have jack points to screw into the wings (behind the main
|
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
| Quote: | Hey, Guys!
1) Where exactly are jacks placed under a Yak for retraction tests?
2) How much of a charge will the pneumatic system require for multiple
retraction cycles?
There'll be more, but for now...HAPPY HOLIDAYS!!
...and THANK YOU!
Rico
*
*
012345
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rijaeger(at)wausau.k12.wi
Guest
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| Posted: Tue Nov 22, 2011 8:56 am Post subject: Yak 52 Questions... |
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Thanks for breaking that down, Mark. If you take it slowly enough, I'm like novocaine - eventually I'll get it. 
| Quote: | >> "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E" <mark.bitterlich(at)navy.mil> 11/22/2011 10:19 AM >>>
--> Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E" <mark.bitterlich(at)navy.mil>
|
The normal air pressure for the system is 735 PSI which equates to 50 atmospheres. Some debate here on nitpicking bars and atmospheres that I will avoid. You have a gage in your cockpit which reads the normal bottle on the left and the emergency bottle pressure on the right. It reads in single digits, like 1-7, and you multiply that by 10 to get the actual reading. So when it reads 5, that means 50 which means 50 atmospheres, which means .... 735 PSI.
Dennis has warned you not to run the bottle down to extremely low pressures because if you do that, and then EXTEND the gear, it will come down fast and hard, which is not the end of the world, but it is also not a really GOOD thing. So, if you have the external air bottle connected, just use it to keep the pressure gage in the cockpit reading between say 3-5. Be careful to fill the bottle in the aircraft SLOWLY. So not just open everything wide open and let er rip. Not good for a number of components, so avoid that.
Emergency blow-down is a whole different subject.
Mark
________________________________
From: owner-yak-list-server(at)matronics.com on behalf of Rico Jaeger
Sent: Tue 11/22/2011 11:04 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
OK, being a complete novice here...I have no idea what "25 atmospheres" is. Will I know how to achieve that when I hook up a welding oxygen tank to the system? I've only dealt w/ PSI. Thank you - and so sorry for the naive questions.
| Quote: | >> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> 11/22/2011 9:41 AM >>>
--> Yak-List message posted by: "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net>
|
More undesirable than damaging because it shakes the heck out of the
airplane while on the jacks. Air pressure? I think I already answered
that. On an average of all 52's a minimum of 25 ATM's will be needed
for any retraction.
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 9:20 AM, Rico Jaeger wrote:
| Quote: | OK. Roger all that. Is a "hard retract" undesirable or potentially
damaging? How much air pressure will I need to do the initial retractions?
>>> "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> 11/22/2011 8:33
AM >>>
You have to have jack points to screw into the wings (behind the main
gear legs) and at the base of the firewall where the lower cowling
attaches. They are 14 mm threads. Jill has them available. I've
attached a photo of the nose jack point. There are two of them...one on
each side of the cowl. BE VERY CAREFUL with the nose jack because the
nose wheel fork has to clear the jack AND the ground when retracting and
extending. Use a 3-legged jack for the nose wheel and make absolutely
certain the wheel assembly will clear the legs of the jack before you
swing the gear. Also, make absolutely certain the nose tire will clear
the ground during the swing up and down. Measure from the pivot axle
bolt (nose wheel mounting point) down through the wheel axle to below
the tire and swing the arc back and forth to make sure the wheel clears
the ground during the retraction. Otherwise, if the nose wheel touches
the ground in any way during the retraction, it will push the airplane
off the nose wheel jack. That would be a real mess.
Once the main system gets down to about 25 Atmospheres you may have
difficulty doing gear retractions and extensions. Understand this Rico,
the lower the pressure in the main air tank the harder the harder the
gear will slam into place when doing retractions and extensions. The
reason being - the air pressure in the actuators acts as a "shock
absorber" on the opposite side of the actuator. ie: when doing a
retraction, the air pressure in the DOWN side of the actuator is
expelled from the actuator as the gear is moving to the UP position and
vice versa. Gravity contributes to the slam when the air pressure is
low in the main air tank and the gear is moved to the DOWN position.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 11/22/2011 7:39 AM, Rico Jaeger wrote:
> Hey, Guys!
> 1) Where exactly are jacks placed under a Yak for retraction tests?
> 2) How much of a charge will the pneumatic system require for multiple
> retraction cycles?
> There'll be more, but for now...HAPPY HOLIDAYS!!
> ...and THANK YOU!
> Rico
> *
>
>
-= November is the Annual List Fund Raiser. Click href="http://www.matronics.com/contribution">http://www.matronics.com/connbsp; -Matt Dralle, List sp; - The Yak-List Email Forum matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-Lisp; - -Matt bsp; (And Get Some AWESOME FREE = * The Builder's Bookstore www.buildersbooks.comsp; --> http://wnbsp; -Matt - The Yak-List href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.c========================http://www.matronics.com/con=================
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rijaeger(at)wausau.k12.wi
Guest
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| Posted: Tue Nov 22, 2011 8:57 am Post subject: Yak 52 Questions... |
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|
Um...that's why I'm "asking."
| Quote: | >> Brian Lloyd <brian(at)lloyd.com> 11/22/2011 10:19 AM >>>
|
On Tue, Nov 22, 2011 at 8:04 AM, Rico Jaeger <rijaeger(at)wausau.k12.wi.us (rijaeger(at)wausau.k12.wi.us)> wrote:
| Quote: | OK, being a complete novice here...I have no idea what "25 atmospheres" is. Will I know how to achieve that when I hook up a welding oxygen tank to the system? I've only dealt w/ PSI. Thank you - and so sorry for the naive questions.
|
NO NO NO NO NO NO NO NO NO NO NO NO !!!!!!!!!!!!!!!!!!
DO NOT USE OXYGEN!!!!!!!!!!!!!!!!!!!!!!
IF YOU USE O2 YOU COULD IGNITE THE OIL IN THE LINES!!!!!!!!
Normally one uses compressed air from a SCUBA tank. If that isn't convenient you can use N2 (nitrogen). N2 is totally safe and eliminates any chance of fire but can (under some conditions) make your engine hard to start.
As for atmospheres, PSI, and kilograms force per square centimeter (kgf/cm^2) here is the skinny:
- The stock gauges read out in kgf/cm^2.
- 1 kgf/cm^2 is very close to one atmosphere, enough so that, in this case you can use them interchangeably.
- 1 atmosphere = 15psi.
- 50 kgf/cm^2 is approximately equal to 750psi.
Hopefully this helps.
I am beginning to get the feeling that you might want to find someone to help you who has a bit more experience.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian(at)lloyd.com (brian(at)lloyd.com)
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
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mark.bitterlich(at)navy.m
Guest
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| Posted: Tue Nov 22, 2011 8:59 am Post subject: Yak 52 Questions... |
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50 atmosphere equals 734.79 PSI to be exact. 14.695 is the conversion factor.
50 kgf/cm2 equals 711.17 PSI
Don't know how you came up with 750 PSI, But hey... you do tend to be exact so I am mentioning it. Bottom line, Lower than 6 on the gage, and higher than 4 is a good thing more or less.
Damn right. Never pump pure oxygen into the airplanes pneumatic system. Sorry we all missed that. Nice catch Brian.
I personally prefer nitrogen.... especially in the emergency air tank of the YAK-52. That tank is NOT filled from the engine compressor and is ONLY filled from the external fill port. Filling the emergency tank with nitrogen is 100% overkill, but if you have it, use it. It will reduce corrosion.
I have heard about the problems with starting. I tend to disagree. The air start system injects air into cylinders during the downward portion of the power stroke on each cylinder it is feeding. Other cylinders are then in the intake and compression strokes and are not really impacted. The lower three or four cylinders are another matter and are PURGED to flow out oil during the starting cycle. Regardless, I have used nitrogen many times in the MAIN bottle, and if it was harder to start, I sure never noticed it.
Mark
________________________________
From: owner-yak-list-server(at)matronics.com on behalf of Brian Lloyd
Sent: Tue 11/22/2011 11:19 AM
To: yak-list(at)matronics.com
Subject: Re: Yak 52 Questions...
On Tue, Nov 22, 2011 at 8:04 AM, Rico Jaeger <rijaeger(at)wausau.k12.wi.us> wrote:
OK, being a complete novice here...I have no idea what "25 atmospheres" is. Will I know how to achieve that when I hook up a welding oxygen tank to the system? I've only dealt w/ PSI. Thank you - and so sorry for the naive questions.
NO NO NO NO NO NO NO NO NO NO NO NO !!!!!!!!!!!!!!!!!!
DO NOT USE OXYGEN!!!!!!!!!!!!!!!!!!!!!!
IF YOU USE O2 YOU COULD IGNITE THE OIL IN THE LINES!!!!!!!!
Normally one uses compressed air from a SCUBA tank. If that isn't convenient you can use N2 (nitrogen). N2 is totally safe and eliminates any chance of fire but can (under some conditions) make your engine hard to start.
As for atmospheres, PSI, and kilograms force per square centimeter (kgf/cm^2) here is the skinny:
1. The stock gauges read out in kgf/cm^2.
2. 1
3.
4. is very close to one atmosphere, enough so that, in this case you can use them interchangeably.
5. 1 atmosphere = 15psi.
6. 50 kgf/cm^2 is approximately equal to 750psi.
Hopefully this helps.
I am beginning to get the feeling that you might want to find someone to help you who has a bit more experience.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian(at)lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
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