Home > VansAirForceForums

- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

Go Back   VAF Forums > Model Specific > RV-9/9A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Thread Tools Search this Thread Display Modes
Old 02-05-2019, 09:09 AM
John Tipton John Tipton is offline
Join Date: Jun 2005
Posts: 4
Default Flap motor misaligned with Flap arm weldment

Hi Guys

Anyone had a problem when finally attaching the Flap motor pushrod with the Flap arm actuator weldment (WD-613-EF), that the two are not properly aligned, and is binding on one flange.

I can't see any other way but to order a replacement F-766A and move the F-766B position over to the left, to allow the Flap motor mounting to move across, thus allowing a clearance fit.

Reply With Quote
Old 02-05-2019, 09:24 AM
RV7ator RV7ator is offline
Join Date: Jan 2005
Location: Boise, ID
Posts: 987

This is an ancient problem carried forward from manual flap days. Van's hasn't repositioned the flap actuator arm to align the arm with the now off center electric motor pushrod. They expect there's enough slack and strength in the assembled parts to withstand twisting the motor mount and the clevis end as the actuator moves up and down.

That sucks, IMHO.

I offset the pushrod bearing outside the arm's clevis and put a bushing in the clevis with a sufficiently long bolt clamping the works. Pay attention to clearances as the mechanism moves through its range of motion. The undesirable outcome is that the arm clevis now must endure a twisting torque since force is applied outside the clevis. But so far, so good, on five RV-7s.

You pays your money and takes your choice.

John Siebold
Reply With Quote
Old 02-05-2019, 10:35 AM
Ralph Inkster Ralph Inkster is offline
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 497

Simple enough to drill off the F-776B and re-position it for better flap motor alignment. Drill new mounting rivet holes & fill the old ones so it looks like it was meant to be!
Maintain lots, upgraded - repaired - & modified more, rebuild a few, & built some too.
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 08:25 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.