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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25704
Location: Livermore CA USA
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 Posted: Tue Oct 06, 2009 8:45 pm Post subject: Cable Routing With Front Mounted Governor... |
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Dear Listers,
I thought I'd share my experience installing the control cable on my IO-390 with a front mounted governor. I was quite perplexed with this task because the intake snorkel takes up most of the left baffle floor and there's not a lot of room for running a control cable for the governor down through the same area. A special bracket would unquestionably be required.
Since the McCauley governor I had was for a rear mount and not a front mount it had the wrong gear ratio (.866 to 1 rear vs .947 to 1 front), I had to order a replacement. A couple of Listers turned me onto the PCU5000 http://www.pcu5000.com/ which is similar in size and mounting to the MT that Van's sells but seems to have less problems with oil flow. I ordered it with the 947:1 gear ratio for the front mounted boss on the IO-390 and with a CLOCKWISE control rotation which means that the control arm turning clockwise *increases* the pitch. The part number for the PCU5000 mounted on an IO-390 is P-520-029/A-947 which can be found on their application chart here: http://www.pcu5000.com/pcu5000x.htm
I scratched my head for quite a while trying to figure out an elegant way of attaching the control cable. I made no less than three complicated brackets out of .063 trying to get the cable to come up from the bottom through the left floor. They mostly worked, but I just wasn't that happy with the operation and the fact that I would have drill a hole in the floor for the cable.
Then I started playing around with the standard VA-153-PC governor bracket and discovered that by drilling two new holes in the bracket in just the right location, I could run the control cable back over the engine and through the rear baffle. The best part is that the control action is really smooth and I'm getting full Max-to-Min travel!!
To orientate the bracket, I removed two screws from the governor at 12 o'clock and 2 o'clock positions. I placed the bracket on the governor and then rotated it counter-clockwise until it just hit the screw at the 10 o'clock position. I marked the two stock hole locations from the bracket onto the governor with a sharpie. I then took the rest of the screws out and with the cap on the work bench I put the bracket on the cap and realigned it with the two marks I had made earlier. Then, from the INSIDE of the cap, I marked the actual cap mounting holes onto the bracket with a sharpie. Over to the drill press to drill the two new marks on the bracket with a #19 drill and then reassemble the whole thing. As you can see from the photos, the alignment came out perfect.
The control cable I'm using is the standard length RV-10 prop governor cable and, at least for the RV-8, is the perfect size.
Best regards,
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's All New RV-8 Construction Blog
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tfarrell839
Joined: 10 Nov 2012
Posts: 27
Location: Watsonville, CA
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| Posted: Wed Jun 18, 2014 1:56 pm Post subject: Re: Cable Routing With Front Mounted Governor... |
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Hi Matt,
How's this working out for you in the long-run? Any issues?
Thanks,
Tim
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Tim Farrell
Aircrafters
831-722-9141 |
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25704
Location: Livermore CA USA
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| Posted: Wed Jun 18, 2014 6:52 pm Post subject: Cable Routing With Front Mounted Governor... |
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At 02:56 PM 6/18/2014 Wednesday, you wrote:
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Hi Matt,
How's this working out for you in the long-run? Any issues?
Thanks,
Tim
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Hi Tim,
It worked out great! The only issue I had was heat from the engine causing some stickige after about 20 hours or so. I replaced the cable and added two sleeves of the firesleeve from FlyBoy Accessories and after 150 more hours never had a problem. I'm not totally convinced that it was heat that caused the cable to go bad. Could have been just manufactured poorly and started to stick for other reasons.
Here's a link to the firesleeves I used:
http://www.flyboyaccessories.com/Fuel-Line-Heat-Rejection-Sleeve-p/2403.htm
Attached are a few pictures of my RV-8 installation with the firesleeves.
-
Matt Dralle
RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 172+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 180+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode
Matt's Livermore Airport Live ATC Stream!
Check out the live ATC stream directly from my hangar at the Livermore
Airport. Includes both Tower and Ground transmissions. Archives too!
For entertainment purposes only. http://klvk.matronics.com
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