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Old 07-16-2017, 11:12 AM
JackinMichigan's Avatar
JackinMichigan JackinMichigan is offline
Join Date: Nov 2012
Location: Canton, MI
Posts: 200
Default Aileron pushrods too shortF

ASsembling the wings. Everything going great until..........adjusting the left aileron.

The pushrod F-1064 LEFT SIDE ONLY is about 5/8" too short. RIght side is fine, and they are identical (in theory).

We can't find what is wrong. All the set-up dimensions check out.

We can screw out each bearing about 5/16 each leaving about 3/8 thread engagement at each end. Not enough I am thinking.

Any body have this problem?
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Old 07-16-2017, 12:30 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,446

I assume what you mean is the pushrod reach is 5/8" short, not the pushrod itself as you say the pushrods are of the correct length.

Perhaps some other verifications are in order. Check:
- The pushrods that connect the aileron bellcrank to the control stick assembly.
- The control stick linkages - are the control sticks parallel?
- Remember to clamp the elevators in neutral as if not, the non-linear pull of the elevator on the control stick linkage moves the ailerons.
- Do you have the pushrods problerly connected to the bell cranks.

As you point out, unscrewing the rod ends works but too much and you have thread engagement problems. If you do this, make both left and right pushrods the same length.

There is a lot of adjustment in the control stick linkage assembly as well.

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Old 07-16-2017, 12:51 PM
N427EF N427EF is offline
Join Date: Oct 2005
Posts: 1,510
Default Several options

As Carl pointed out, you have several places in the "chain" of linkages
to lengthen or shorten the push rods to achieve the distance needed in the last
linkage segment from the bell crank to the aileron.
provided your sticks are parallel and perpendicular to the pitch axis you can start by checking the first linkage to the bell crank in the wing root.
Provided those are according to plans you can further check the push rods to the wing bell crank and if those are according to plans your last push rod from the bell crank to the aileron should be a perfect fit without any issues on thread engagement.
Consult some local RV help if you still have issues.
Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 400 plus hours
Over 2500 Gallons of E10 mogas burned
Don't believe everything you know.
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Old 07-16-2017, 01:17 PM
Jesse's Avatar
Jesse Jesse is offline
Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,442

If one pushrods is too short, or doesn't reach, I like to find one that will fix the problem by shortening. If that's not an option, then lengthening more than one by half as much each may serve the purpose also.

I should it possible that the wing root torque tube and bell crank is either built wrong or possibly on the wrong wing? Look at the plans page 23-6. The 5/16" spacer on the wrong side could very well be the 5/8" you are off.
Jesse Saint (Saint Aviation, Inc. - VAF Advertiser)
RV Hotel (hangar, room, car) at X35 in north FL

Commercial ASEL/S A&P/IA EAA Technical Counselor

Dynamic Prop Balancing, Prebuy Inspections, Condition Inspections, Repairs and Mods, Injector Tuning, Airframe, Engine, Panel Upgrades, Ferrying, etc.
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Old 07-16-2017, 02:46 PM
JackinMichigan's Avatar
JackinMichigan JackinMichigan is offline
Join Date: Nov 2012
Location: Canton, MI
Posts: 200
Default Here is what I have checked

1) There is a simple jig used at the bellcrank out on the wing... check

2) The is a dimension called out on the plans of 2 9/32 from the attachment to the lever hole to first wing rib... check

3) The pushrod is to be initially built to 14 7/8.... check

NOTE: If I checked nothing else but 2 & 3.. that is where the pushrod fits. The pushrod fits between the stick (vertical) and the attachment lever (proper location). But it doesn't??

4) The ailerons are set at zero travel

5) The sticks are straight up and parallel.

Going back and re-checking everything.

Thanks guys...
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