---------------------------------------------------------- RV8-List Digest Archive --- Total Messages Posted Tue 08/18/09: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 05:25:14 PM PST US From: Speedy11@aol.com Subject: RV8-List: 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 _____________________________________ Time: 06:13:54 PM PST US From: Matt Dralle Subject: RV8-List: 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 > > > >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. > > > > >PropGov02.JPG (511702 bytes) > > > >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. > > >PropGov06.JPG (511870 bytes) > >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 http://www.matronics.com/ WWW | Featuring Products For Aircraft ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv8-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV8-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv8-list Browse Digests http://www.matronics.com/digest/rv8-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.