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1. 12:09 PM - Re: [RV-9A] Andy, what's the fix for the heavy wing? (Andy Karmy)
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Subject: | Re: [RV-9A] Andy, what's the fix for the heavy wing? |
--> RV9-List message posted by: "Andy Karmy" <andy@karmy.com>
Well.... It's like this. The word from Vans was that there is no easy fix for true
out of rig heavy wings on the RV9... No trailing edges to squeeze etc.
Now for the rest of the story. During wing construction I mounted the ailerons
& set to neutral per the instructions. Fixed the pushrod in place and mounted
the tips with nutplates and screws. So far so good. When I mounted the wings for
good at the airport many months later I had to face the task of rigging the
controls up to the aileron bellcranks for the first time. Lets just say I didn't
do it right and that was the start of my problems.
There are lots of places to adjust the rigging and they are all interrelated in
one way or another. By the time I was finished I had everything hooked up and
lined up, except the left wingtip was about 1/2" low compared to the neutral
position of the aileron. Now is when you should spend the time to figure out why
that is the case. I fairly quickly determined that I must have done something
wrong while mounting the tips way back when. I have heard of many RV4's and
6's that have had to slice the TE of the tip and reglass them in the proper location,
so I go off and cut the tip and reset "neutral" to be in line with the
rest of the controls.
DANGER, this is where i introduced all of my problems.
The original tip location was the right location and it was the ailerons and flaps
that were positioned wrong. I had trouble figuring out how to keep everything
in alingment while setting up the pushrods to the sticks etc.
So here's how to avoid all of this. Do the wings and tips like the manual says.
When mounting the wings, first mount the wings, then the ailerons, then the tips,
now you can clamp the aileron to the tip to hold neutral (you already set
that with the belcrank jig right?) Now you can adjust the rest of the pushrods
to match the fixed aileron locations and then adjust the flaps to match.
So in the end, I opened up everything, pulled the tips, reverted back to the airfoil
alingment in the tooling holes, reset all the links to neutral, reglassed
the tip back down and everything flys straight!
- Andy
---------- Original Message ----------------------------------
From: "Brian" <bsowell@digitex.net>
>Thinking about the right corrective action for a heavy wing has kept
>me up at night. Have you taken care of this yet? What was
>recommended by Van's? What worked or didn't work?
>
>Thanks for everything you've done for us RV9ers.
>
>Brian
>9612S (reserved)
>Building the wings
>
>
>Make Money Online Auctions! Make $500.00 or We Will Give You Thirty Dollars for
Trying!
>http://us.click.yahoo.com/yMx78A/fNtFAA/46VHAA/1yWplB/TM
>
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>
>
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