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Yak52 - Prop/Governor problem - help/advice needed

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nigel(at)yakdisplay.com
Guest

Posted: Wed Jul 22, 2015 9:39 am Post subject: Yak52 - Prop/Governor problem - help/advice needed

Asking the fount of all yak knowledge....



Pre-take off checks prop cycle check all fine (70% down to 53% three times).

On take-off, prop went to 110% and stayed there.

Moving the prop lever to full course made no difference to RPM.



Reduced power to bring RPM under control, abbreviated circuit and landed.



Have changed to governor - but appears to still be a problem.



Have had the prop off - and checked blades move freely, and oil is returned when blades are rotated.



Drive to governor appears to be ok (rotates when prop is turned).



Problem obviously appears to be when the prop is under load.



Can anyone shed any light, experience of happening before?



Clarification of my understanding would also be useful re what does what - i.e. oil pressure causes fine pitch, weights cause course pitch? In that case, is it a governor drive problem when under load? IS there a weak link in the drive system like the compressor?

Any ideas? 



Regards, 

Nigel Willson 

Flying Instructor/Examiner and Display Pilot

_________________________________________________ 

 email: nigel(at)yakdisplay.com

 mobile: (+44) 7809 116676 

 web: http://yakdisplay.com

GeorgeCoy

Joined: 02 Dec 2010
Posts: 310

Posted: Wed Jul 22, 2015 9:50 am Post subject: Yak52 - Prop/Governor problem - help/advice needed

check the clamps that secure the cable housing. 



--

jan.mevis(at)informavia.b
Guest

Posted: Wed Jul 22, 2015 10:10 am Post subject: Yak52 - Prop/Governor problem - help/advice needed

That's a very good advise George. We had recently some RPM problems on our

Yak 52 because of that.

Jan



On 22/07/15 19:47, "George S. Coy" <owner-yak-list-server(at)matronics.com on

behalf of george.coy(at)gmail.com> wrote:



[quote]



check the clamps that secure the cable housing.



--

nigel(at)yakdisplay.com
Guest

Posted: Wed Jul 22, 2015 10:19 am Post subject: Yak52 - Prop/Governor problem - help/advice needed

Yup, done that. All secure....



Regards, 

Nigel Willson 

Flying Instructor/Examiner and Display Pilot

_________________________________________________ 

 email: nigel(at)yakdisplay.com

 mobile: (+44) 7809 116676 

 web: http://yakdisplay.com

--

GeorgeCoy

Joined: 02 Dec 2010
Posts: 310

Posted: Wed Jul 22, 2015 10:48 am Post subject: Yak52 - Prop/Governor problem - help/advice needed

When we had prop problems we could not figure out, I tapped into the oil line on the nose case and ran a 1/4 in hose to a pressure gauge and taped it to the cowl so I could see what was really happening with the oil pressure during flight. This was years ago when we were messing around with Hoffman props. 

George

On Wed, Jul 22, 2015 at 2:07 PM, Jan Mevis <jan.mevis(at)informavia.be (jan.mevis(at)informavia.be)> wrote:

[quote]--> Yak-List message posted by: Jan Mevis <jan.mevis(at)informavia.be (jan.mevis(at)informavia.be)>

 That's a very good advise George. We had recently some RPM problems on our

 Yak 52 because of that.

 Jan

 On 22/07/15 19:47, "George S. Coy" <owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) on

 behalf of george.coy(at)gmail.com (george.coy(at)gmail.com)> wrote:

 >--> Yak-List message posted by: "George S. Coy" <george.coy(at)gmail.com (george.coy(at)gmail.com)>

 >

 >check the clamps that secure the cable housing.

 >

 >--

trond.sorgard(at)gmail.co
Guest

Posted: Mon Jul 27, 2015 4:23 am Post subject: Yak52 - Prop/Governor problem - help/advice needed

Hello George

I have had also some problems with my propeller cycling earlier, Moving the prop lever to full course made no difference to RPM with me aswell.Â 

But this was on the ground testing under run up.Â 

I also has tapped into my cowl to check oil pressure in certain RPM handle positions. I had 220PSI with RPM handle fully foward.

And 0 PSI approx. when handle in full Course(aft). As it should be.

When the oil gets warm... real warm, then its able to cycle.

After i changed oil it became much better, but still im not happy.the oil needs to be real warm to cycle on ground run up.

And in aerobatic flights its not hundred prosent able to maintain RPM, lets say in a loop.

Â 

George, what was the problem in your case? did you find it out?

Â 

I have a Hoffman Prop also. I bought my Yak-52W from you and Cliff, from a former airline pilot in Washington. And you shipped it to me in Norway.

Any suggestion and thoughts?

Regards Trond SÃ¸rgÃ¥rd

Bergen, Norway.

2015-07-22 20:46 GMT+02:00 George Coy <george.coy(at)gmail.com (george.coy(at)gmail.com)>:

[quote]When we had prop problems we could not figure out, I tapped into the oil line on the nose case and ran a 1/4 in hose to a pressure gauge and taped it to the cowl so I could see what was really happening with the oil pressure during flight. This was years ago when we were messing around with Hoffman props. 

George

On Wed, Jul 22, 2015 at 2:07 PM, Jan Mevis <jan.mevis(at)informavia.be (jan.mevis(at)informavia.be)> wrote:

[quote]--> Yak-List message posted by: Jan Mevis <jan.mevis(at)informavia.be (jan.mevis(at)informavia.be)>

 That's a very good advise George. We had recently some RPM problems on our

 Yak 52 because of that.

 Jan

 On 22/07/15 19:47, "George S. Coy" <owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) on

 behalf of george.coy(at)gmail.com (george.coy(at)gmail.com)> wrote:

 >--> Yak-List message posted by: "George S. Coy" <george.coy(at)gmail.com (george.coy(at)gmail.com)>

 >

 >check the clamps that secure the cable housing.

 >

 >--

trond.sorgard(at)gmail.co
Guest

Posted: Mon Jul 27, 2015 4:25 am Post subject: Yak52 - Prop/Governor problem - help/advice needed

Im might add,Â I have cheked the wire clamp, seems ok, and the governor is changed to a new one, as i thought that might be it.

Trond



  [quote][b]

richard.goode(at)russiana
Guest

Posted: Mon Jul 27, 2015 5:20 am Post subject: Yak52 - Prop/Governor problem - help/advice needed

The Russian Â V-530 propeller needs 15 bar â€“ pretty much your 220 PSI. However, the MT propeller needs 22 bar â€“ around 330 PSI to change pitch quickly. You achieve this with stronger pressure control springs in the governor. I suspect that the same is true of the Hoffman.

 

 Also, have you checked the oil filter going into the governor â€“ if this is partially blocked, you will inevitably have pitch change problems. 

 

Richard Goode

 

Rhodds Farm 

Lyonshall 

Hereford 

HR5 3LW 

United Kingdom 

 Tel: +94 (0) 81 241 5137 (Sri Lanka)

Tel:   +44 (0) 1544 340120 

Fax:  +44 (0) 1544 340129 

www.russianaeros.com

Iâ€™m currently in Sri Lanka but this Mail is working,and my local phone is +94 779 132 160.

 

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Trond SÃ¸rgÃ¥rd

Sent: Monday, July 27, 2015 5:49 PM

To: yak-list(at)matronics.com

Subject: Re: Yak52 - Prop/Governor problem - help/advice needed



 

Hello George

 

I have had also some problems with my propeller cycling earlier, Moving the prop lever to full course made no difference to RPM with me aswell. 



But this was on the ground testing under run up. 



I also has tapped into my cowl to check oil pressure in certain RPM handle positions. I had 220PSI with RPM handle fully foward.



And 0 PSI approx. when handle in full Course(aft). As it should be.



When the oil gets warm... real warm, then its able to cycle.



 



After i changed oil it became much better, but still im not happy.the oil needs to be real warm to cycle on ground run up.



And in aerobatic flights its not hundred prosent able to maintain RPM, lets say in a loop.



 



George, what was the problem in your case? did you find it out?



 



I have a Hoffman Prop also. I bought my Yak-52W from you and Cliff, from a former airline pilot in Washington. And you shipped it to me in Norway.



Any suggestion and thoughts?



 



Regards Trond SÃ¸rgÃ¥rd



Bergen, Norway.



 

2015-07-22 20:46 GMT+02:00 George Coy <george.coy(at)gmail.com (george.coy(at)gmail.com)>:

When we had prop problems we could not figure out, I tapped into the oil line on the nose case and ran a 1/4 in hose to a pressure gauge and taped it to the cowl so I could see what was really happening with the oil pressure during flight. This was years ago when we were messing around with Hoffman props. 



George



 

On Wed, Jul 22, 2015 at 2:07 PM, Jan Mevis <jan.mevis(at)informavia.be (jan.mevis(at)informavia.be)> wrote:

--> Yak-List message posted by: Jan Mevis <jan.mevis(at)informavia.be (jan.mevis(at)informavia.be)>



That's a very good advise George. We had recently some RPM problems on our

Yak 52 because of that.

Jan



On 22/07/15 19:47, "George S. Coy" <owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) on

behalf of george.coy(at)gmail.com (george.coy(at)gmail.com)> wrote:



[quote]--> Yak-List message posted by: "George S. Coy" <george.coy(at)gmail.com (george.coy(at)gmail.com)>



check the clamps that secure the cable housing.



--

dsavarese0812(at)bellsout
Guest

Posted: Mon Jul 27, 2015 5:20 am Post subject: Yak52 - Prop/Governor problem - help/advice needed

Many times I have seen where the prop governor armis improperly 

positioned.   Not the stops. The position of the arm in relation to the 

rotating shaft is critical. If the preload position of the rotating 

shaft is incorrect (where the arm is attached along with the serrated 

sleeve), it willcause the prop blades not to move to either full fine or 

full coarse pitch. Proper adjustment procedure is in the M14 maintenance 

manual.



Attached is the applicable task card.



A. Dennis Savarese

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1



On 7/27/2015 7:22 AM, Trond SÃ¸rgÃ¥rd wrote:

 	  Quote: 	
		   Im might add,

 I have cheked the wire clamp, seems ok, and the governor is changed to 

 a new one, as i thought that might be it.



 Trond

 http://www.matronics.com/contribution

M14_Prop_Governor_Adjustment_on-engine.pdf

Description:

Download

Filename:

M14_Prop_Governor_Adjustment_on-engine.pdf

Filesize:

16.16 KB

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nigel(at)yakdisplay.com
Guest

Posted: Mon Jul 27, 2015 5:58 am Post subject: Yak52 - Prop/Governor problem - help/advice needed

Turned out to be a slipping gasket blocking the oil return hole to the gallery.....

 Regards,

 Nigel Willson

 Flying Instructor / Examiner

 Display Pilot

 Tel. 07809 116676

 Web. yakdisplay.com

 Sent from my HTC One mini 2

 ----- Reply message -----

 From: "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net>

 To: "yak-list(at)matronics.com" <yak-list(at)matronics.com>

 Subject: Yak52 - Prop/Governor problem - help/advice needed

 Date: Mon, Jul 27, 2015 14:35

  Many times I have seen where the prop governor armis improperly 

 positioned.   Not the stops. The position of the arm in relation to the 

 rotating shaft is critical. If the preload position of the rotating 

 shaft is incorrect (where the arm is attached along with the serrated 

 sleeve), it willcause the prop blades not to move to either full fine or 

 full coarse pitch. Proper adjustment procedure is in the M14 maintenance 

 manual.

 Attached is the applicable task card.

 A. Dennis Savarese

 334-546-8182 (mobile)

 www.yak-52.com

 Skype - Yakguy1

 On 7/27/2015 7:22 AM, Trond Sørgård wrote:

 > Im might add,

 > I have cheked the wire clamp, seems ok, and the governor is changed to 

 > a new one, as i thought that might be it.

 >

 > Trond

 > http://www.matronics.com/contribution 

     [quote][b]

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