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Old 04-09-2018, 11:07 PM
BruceW BruceW is offline
Join Date: Aug 2005
Location: Sacramento, CA
Posts: 107
Default Tru Trak pitch servo install question- RV-7

Got a used Alt Hold setup going in my RV-7.
Wondering about the bolt direction for the pushrod onto the elevator bellcrank.
The bolt head faces toward F-728A Bellcrank Channel.
Seems if the nut ever dropped off and the bolt began to work out, it could extend out to the F-728A channel and then extend past in the up elevator movement and possibly lock things up. (yes, better with a picture).

The Vans plans have the bolt for the top pushrod going the other way with the threads facing the F-728A channel.
Any reason why NOT to switch the servo pushrod bolt around on the bellcrank?
Bruce W
(300+ hours)
Sacramento, CA
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Old 04-10-2018, 06:57 PM
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Jesse Jesse is offline
Join Date: May 2005
Location: X35 - Ocala, FL
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It can go either way.
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Old 04-11-2018, 09:08 AM
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Raymo Raymo is offline
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Consider replacing the nylock nut with a castellated/cotterpin setup so you won't have to worry about the nut backing off.
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Old 04-11-2018, 01:14 PM
Ralph Inkster Ralph Inkster is offline
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 452

Don't forget to put a spacer washer in the bellcrank so the bolt doesn't deform it.
Maintain lots, upgraded - repaired - & modified more, rebuild a few, & built some too.
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Old 04-11-2018, 02:28 PM
BruceW BruceW is offline
Join Date: Aug 2005
Location: Sacramento, CA
Posts: 107

Ralph, yup got the washer in. Went almost too easy. was expecting a few drop-&-finds with the install.

Raymo. I thought about a castle nut and cotter pin. Just wasnt wild about having to back off the torque if needed for the pin line up.

Thanks for the replies.
Bruce W
(300+ hours)
Sacramento, CA
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Old 04-12-2018, 07:16 AM
rvsxer rvsxer is offline
Join Date: May 2007
Location: Inver Grove Hgts, MN
Posts: 302

If you can get the correct torque and install the cotter pin, fine. If you can't, use a self-locking (nylock or all metal) nut. Rod end ball joints must have the ball captured so the ball rotates in it's race. That's why self locking nuts are acceptable for the control surface hinges. There is no rotation at the bolt.
Mike Hilger
RV-6 N207AM w/G3X, 1,600 hours +
South St. Paul, MN (KSGS)
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