Today's Message Index:
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1. 05:25 PM - Re: Governor Control Throws... (Speedy11@aol.com)
2. 06:13 PM - Re: RV8-List Governor Control Throws... (Matt Dralle)
Message 1
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| Subject: | Re: Governor Control Throws... |
Matt.
I had exactly the same issue and I went for the high RPM stop and accepted
the 1/8" short of the stop at the low end. So, far it is flying fine.
Stan Sutterfield
Do no archive
I've got the control cable going to the Governor working well and the
routing under
the engine nicely aligned so that it doesn't touch the sump. I've got a
question regarding the control throw limits, though. Right now at HIGH
RPM, the
control on the Governor is hitting the stop as it should. No problem
there.
However, on full LOW RPM, I'm about 1/8" away from hitting the stop on the
Governor. I've fiddled around with the available adjustments 'til I'm
blue in
the face and I just can't get that last little bit of LOW. Given the
angle of
the bracket, its kind of a pull backwards for the pushrod so its just never
really going to work with the current bracket. My question is this: Does
it really
matter? When what the last time anyone actually had full LOW RPM setting?
Thoughts?
Message 2
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| Subject: | Re: RV8-List Governor Control Throws... |
Great pics, Stan. Thanks.
I noticed that your Allen head screws are drilled for safety wire. Mine aren't.
I wonder if I'm still suppose to safety wire them...?
Matt
At 05:54 PM 8/18/2009 Tuesday, you wrote:
>Photos follow.
>Stan
>
>
><http://www.rv-8a.net/images/PropGov01.JPG>
>PropGov01.JPG (516448 bytes)
>
>
>The forward mounted prop governor requires some engineering to get correct movements.
In the photo above, the aft position (shown) of the governor arm is the
high rpm (flat pitch) setting. However, a control cable connected directly
to it would cause the prop pitch to work opposite to normal operation. So the
cable to the governor must come from below and the actuator arm must be rotated
counterclockwise to align with the cable. That will force us to bring the
control cable through the lower ramp of the baffles.
>
>
>
><http://www.rv-8a.net/images/PropGov02.JPG>
>PropGov02.JPG (511702 bytes)
>
>
><http://www.rv-8a.net/images/PropGov03.JPG>
>PropGov03.JPG (511769 bytes)
>
>
>The cable bracket that Nelson made appears to be correct. I'll attach to the
inboard side of the lever arm and I'm thinking about making a fairing to fit around
the governor. I'll have to devise a slit rubber pass through for the cable
to go through the intake cooling air ramps. I saw one on a RV-10 at SnF that
should work
>
>
>
>The prop control does not have enough authority to get full travel on the prop
governor. The only way to get additional throw before hitting the throttle quadrant
stops was to redrill the clevis attachment hole in the prop lever for
the prop cable. Nelson marked it and we drilled a new hole that gives greater
governor movement for the same amount of lever movement. It was as high as we
could move the hole and it still wasn't enough, so on the phone to MT Propellors
of Deland, FL to ask if they had encountered the problem before. I've heard
of other builders having the same problem, but the guy I talked to at MT (Urgen)
had not heard of it. He said we must have full authority to the high RPM
end and we can accept not quite reaching the stop on the low RPM side. We
now reach the high stop and are about 1/8" off the low stop. Torqued and safety
wired the governor.
>
><http://www.rv-8a.net/images/PropGov06.JPG>
>PropGov06.JPG (511870 bytes)
> <http://www.rv-8a.net/images/PropGov05.JPG>
>PropGov05.JPG (527855 bytes)
>
>I've got the control cable going to the Governor working well and the routing
under
>the engine nicely aligned so that it doesn't touch the sump. I've got a
>question regarding the control throw limits, though. Right now at HIGH RPM, the
>control on the Governor is hitting the stop as it should. No problem there.
>However, on full LOW RPM, I'm about 1/8" away from hitting the stop on the
>Governor. I've fiddled around with the available adjustments 'til I'm blue in
>the face and I just can't get that last little bit of LOW. Given the angle of
>the bracket, its kind of a pull backwards for the pushrod so its just never
>really going to work with the current bracket. My question is this: Does it really
>matter? When what the last time anyone actually had full LOW RPM setting?
>
>
>
>----------
Matt G Dralle | Matronics | PO Box 347 | Livermore | CA | 94551
925-606-1001 V | 925-606-6281 F | dralle@matronics.com Email
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