REFLECTOR: RIGGING

Jim Sower canarder at frontiernet.net
Tue Aug 30 21:06:01 CDT 2005


On swept wings, rudder influences roll more than straight wings. I would 
not worry about shimming the wings until I had the ball centered with 
rudder trim (as you have done). It doesn't take much of an error in 
winglet alignment to generate a good bit of yaw. I'm not sure where 
you're measuring the 1/4", but you might be able to reduce that a little 
by reducing the deflection of the other rudder a little. Be SURE to NOT 
reflex it past neutral since that invites flutter. Be VERY careful if 
you try to even them out this way.
My .02 ... Jim S.

Tom Martino wrote:

> I am approaching my 40 hours (20 for plane, 20 for engine) … and I 
> have finally gotten the plane to fly straight and level by shimming my 
> left rudder (it sticks out about ¼ inch) … I glued a rubber stop to 
> the inboard edge of the wing (where the rudder rests).
>
> I would like to check my reasoning here to see if I corrected the 
> problem correctly and made accurate assumptions:
>
> When first attempting to fly straight and level with “hands and feet 
> off” … the bubble was out to the left and the nose pointed slightly to 
> the right and the left wing wanted to rise.
>
> I assumed this condition as caused by a yaw problem (rudder trim 
> correctable) rather than a wing incidence problem.
>
> I figured … if it was just a wing-incidence problem, the yaw would not 
> necessarily be off. On the other hand … a yaw problem alone could 
> cause the outboard wing to lift.
>
> Since shimming the rudder was the easiest thing to do, I shimmed it! 
> That correct the yaw problem and the wings now stay level.
>
> So here is my question: Did I make the correct assumptions? Could I 
> actually have a wing-incidence problem … that is now being masked by 
> the shimmed rudder?
>
> Had I adjusted the wing incidence … would that have corrected the yaw 
> and wing lift problem?
>
> I know that this sounds complicated … but I simply want to know that I 
> am attacking the problem in the right spot.
>
> Thanks in advance for your opinions.
>
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