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dgraham7(at)TWCNY.RR.COM
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 Posted: Wed Aug 04, 2010 3:25 pm Post subject: Sensenich Prop |
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Hello. I have a Zodiac 601 HDS. I had GSC 68 inch, 3 blade prop. Today I switched to a 68 inch Sensenich prop.
It was a bit bumpy up there this afternoon, but at 5000 RPM, it seems that I have picked up 15 mph with the
Sensenich prop. I will try to report more solid numbers later. The blade is pitched to 3; (the pitch numbers go from 1 to 5)
When I did a static run-up, it was 4700/4800 rpm. When I got up to altitude and leveled it out, the most RPM I could get was 5100.
The fellow who built my plane has a rubber stop about an inch long between the panel and the throttle. I am trying to think this through.
My plan is to cut the rubber stop until I am able to reach either 5500 or 5800. This would give me more RPM at takeoff and allow me
to cruise faster if I want to.
Sound like a plan ??
Regards,
Damien
N48TK
[quote][b]
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daberti(at)sbcglobal.net
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| Posted: Wed Aug 04, 2010 4:22 pm Post subject: Sensenich Prop |
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If the rubber stop is a throttle stop to prevent over travel damage cutting the stop will do nothing. If you got higher rpm with the old prop the new one is pitched to heavy.
[quote]
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flyadive(at)gmail.com
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| Posted: Thu Aug 05, 2010 3:07 am Post subject: Sensenich Prop |
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Damien:
You bet it sounds like a plan. YOU are thinking correctly. The fellow who put the 'stop' in was NOT.
The carb/throttle linkage on the engine is what is suppose to limit the RPM not some stop that picked to do
who know what standard and why. Just think what would happen if you were at a high altitude airport or had one of those
high density days. You could wind up in the trees at the end of the runway.
If the engine has a problem of over revving ... Check the carb. Or at least, INCREASE the pitch on the prop.
That will give you more speed. Don't decrease your safety margin.
Barry
On Wed, Aug 4, 2010 at 7:24 PM, Damien <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)> wrote:
[quote] Hello. I have a Zodiac 601 HDS. I had GSC 68 inch, 3 blade prop. Today I switched to a 68 inch Sensenich prop.
It was a bit bumpy up there this afternoon, but at 5000 RPM, it seems that I have picked up 15 mph with the
Sensenich prop. I will try to report more solid numbers later. The blade is pitched to 3; (the pitch numbers go from 1 to 5)
When I did a static run-up, it was 4700/4800 rpm. When I got up to altitude and leveled it out, the most RPM I could get was 5100.
The fellow who built my plane has a rubber stop about an inch long between the panel and the throttle. I am trying to think this through.
My plan is to cut the rubber stop until I am able to reach either 5500 or 5800. This would give me more RPM at takeoff and allow me
to cruise faster if I want to.
Sound like a plan ??
Regards,
Damien
N48TK
| Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
ttp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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[b]
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Thu Aug 05, 2010 3:49 am Post subject: Sensenich Prop |
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Damien, before you go whacking away at the rubber stop, pull the cowl, take off the air filters or filter box, and do a visual check to make sure the throttle plates are fully open when the throttle lever is against the stop. If they aren't, find a good mechanic and get the throttle cables adjusted properly. Have him do a mechanical and pneumatic synchronization of the carbs while he's at it. If the carbs are out of synch you could be losing RPM even if the engine seems to be running fine.
Rick Girard
On Thu, Aug 5, 2010 at 6:06 AM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
[quote] Damien:
You bet it sounds like a plan. YOU are thinking correctly. The fellow who put the 'stop' in was NOT.
The carb/throttle linkage on the engine is what is suppose to limit the RPM not some stop that picked to do
who know what standard and why. Just think what would happen if you were at a high altitude airport or had one of those
high density days. You could wind up in the trees at the end of the runway.
If the engine has a problem of over revving ... Check the carb. Or at least, INCREASE the pitch on the prop.
That will give you more speed. Don't decrease your safety margin.
Barry
On Wed, Aug 4, 2010 at 7:24 PM, Damien <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)> wrote:
| Quote: | Hello. I have a Zodiac 601 HDS. I had GSC 68 inch, 3 blade prop. Today I switched to a 68 inch Sensenich prop.
It was a bit bumpy up there this afternoon, but at 5000 RPM, it seems that I have picked up 15 mph with the
Sensenich prop. I will try to report more solid numbers later. The blade is pitched to 3; (the pitch numbers go from 1 to 5)
When I did a static run-up, it was 4700/4800 rpm. When I got up to altitude and leveled it out, the most RPM I could get was 5100.
The fellow who built my plane has a rubber stop about an inch long between the panel and the throttle. I am trying to think this through.
My plan is to cut the rubber stop until I am able to reach either 5500 or 5800. This would give me more RPM at takeoff and allow me
to cruise faster if I want to.
Sound like a plan ??
Regards,
Damien
N48TK
|
| Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
[b]
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flyadive(at)gmail.com
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| Posted: Thu Aug 05, 2010 4:24 am Post subject: Sensenich Prop |
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Good point Rick:
Damien, as Rick said and I should have been clearer... Check the throttle plate, and make sure they go from stop to stop. The only reason I can think of to add the rubber is for repairs down the road. If the end of the cable becomes nicked or damaged over time, by removing the rubber you would gain that 1" back for making an end connection.
Barry
On Thu, Aug 5, 2010 at 7:49 AM, Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)gmail.com)> wrote:
[quote] Damien, before you go whacking away at the rubber stop, pull the cowl, take off the air filters or filter box, and do a visual check to make sure the throttle plates are fully open when the throttle lever is against the stop. If they aren't, find a good mechanic and get the throttle cables adjusted properly. Have him do a mechanical and pneumatic synchronization of the carbs while he's at it. If the carbs are out of synch you could be losing RPM even if the engine seems to be running fine.
Rick Girard
On Thu, Aug 5, 2010 at 6:06 AM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
| Quote: | Damien:
You bet it sounds like a plan. YOU are thinking correctly. The fellow who put the 'stop' in was NOT.
The carb/throttle linkage on the engine is what is suppose to limit the RPM not some stop that picked to do
who know what standard and why. Just think what would happen if you were at a high altitude airport or had one of those
high density days. You could wind up in the trees at the end of the runway.
If the engine has a problem of over revving ... Check the carb. Or at least, INCREASE the pitch on the prop.
That will give you more speed. Don't decrease your safety margin.
Barry
On Wed, Aug 4, 2010 at 7:24 PM, Damien <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)> wrote:
| Quote: | Hello. I have a Zodiac 601 HDS. I had GSC 68 inch, 3 blade prop. Today I switched to a 68 inch Sensenich prop.
It was a bit bumpy up there this afternoon, but at 5000 RPM, it seems that I have picked up 15 mph with the
Sensenich prop. I will try to report more solid numbers later. The blade is pitched to 3; (the pitch numbers go from 1 to 5)
When I did a static run-up, it was 4700/4800 rpm. When I got up to altitude and leveled it out, the most RPM I could get was 5100.
The fellow who built my plane has a rubber stop about an inch long between the panel and the throttle. I am trying to think this through.
My plan is to cut the rubber stop until I am able to reach either 5500 or 5800. This would give me more RPM at takeoff and allow me
to cruise faster if I want to.
Sound like a plan ??
Regards,
Damien
N48TK
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| Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
ttp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
[b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Aug 05, 2010 4:56 am Post subject: Re: Sensenich Prop |
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Damien,
Adjust the cables at the throttle arm on the carb so the carbs can open all the way. I would leave your rubber stop alone. Your throttle when pulled back should just hit the stop in the cockpit at the same time the carb throttle arm on the carb hits its stop screw. When the throttle in the cockpit is WOT so should the throttle arm on the carb. If they open all the way then leave them alone and flatten the pitch of the prop to get 5500-5600 WOT flat and level. This rpm will give you the best balance between climb, cruise and fuel economy. No use having more rpm than that unless you have a very special circumstance that you need extra climb, but then you loose some cruise and fuel. You can only run over 5500 rpm for 5 min. and you don't cruise up in those rpm's anyway so leave the WOT rpm at 5500. If you are only getting 5100 WOT now then take out another 2.25 degrees on the prop.
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
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Dick Maddux
Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl
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| Posted: Thu Aug 05, 2010 9:44 am Post subject: Sensenich Prop |
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Damian,
Rotax wants a minimum of 5200 static/takeoff (at) wide open throttle(WOT) per their service bulletin. Older cases (such as mine) have been cracked by not following this.
Dick Maddux
912Ul
Milton,Fl
[quote][b]
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dgraham7(at)TWCNY.RR.COM
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| Posted: Thu Aug 05, 2010 10:13 am Post subject: Sensenich Prop |
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Dick:
Thanks very much for this info. I was at the airfield this morning repitching the prop and I ended up
with a static of between 5100 and 5200. I will adjust it again to make sure I get at least 5200 static.
Regards,
Damien
[quote] ---
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dougsnash
Joined: 14 Apr 2008
Posts: 281
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| Posted: Fri Aug 06, 2010 3:07 am Post subject: Sensenich Prop |
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Keep in mind that this is a Zenith product we're talking about and Chris Heintz is a master of simplistic designs. The end result often looks a little wierd but functions very well.
I'm not a 601 builder but since it was designed around the same time, I'd bet it has the same throttle arrangement as my 701 is supposed to have. The throttle actuators that are on the instrument panel do not attach directly to the carbs. They run through the firewall to a cross tube that joins the left and right throttle controls together. Then at some point on this cross shaft is another set of arms that connect to the cables that actually run to the carbs. The arrangment sounds clunk and looks pretty wierd but works pretty well.
If the 601 we are talking about has the stock Zenith throttle actuator, it is a steel tube or rod with a "T" handle on the end of it. The purpose of the rubber bumper is to keep the "T" bar away from the panel so it can be grabbed easily.
Essentially, trimming a little off of the rubber would not likely hurt the function of the plane but as has been said, you might be better off pulling the cowl and going through the full throttle linkage setup to verify that you are getting full throttle opening.
Best of luck.
Doug MacDonald
CH-701 Scratch Builder
NW Ontario, Canada
912 UL
| Quote: |
Time: 04:49:57 AM PST US
Subject: Re: Sensenich Prop
From: Richard Girard <aslsa.rng(at)gmail.com>
Damien, before you go whacking away at the rubber stop,
pull the cowl, take
off the air filters or filter box, and do a visual check to
make sure the
throttle plates are fully open when the throttle lever is
against the stop.
If they aren't, find a good mechanic and get the throttle
cables adjusted
properly. Have him do a mechanical and pneumatic
synchronization of the
carbs while he's at it. If the carbs are out of synch you
could be losing
RPM even if the engine seems to be running fine.
Rick Girard
|
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dgraham7(at)TWCNY.RR.COM
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| Posted: Fri Aug 06, 2010 4:12 am Post subject: Sensenich Prop |
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| Quote: | Thanks to all of you for your responses to my inquiry about
changing to the Sensenich prop. I now have a solid base to
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go forward with.
I will let you know how it works out.
Regards,
Damien
DO NOT ARCHIVE
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