ORIGINAL: boosted180
i have a quick question about the wall. when i pull full up elevator, one wing always drops and i'd always have to quickly correct with rudder. i cannot get my edge 540 to do a "clean" wall manuver. why does it do this? i dont think it's a lateral balance problem or a problem of unmatched elevator halves, b/c sometimes it'll drop the right wing other times it'll drop the left wing.
i have the same problem doing the waterfall. basically any manuver that requires hard full elevator, the plane will not stay "straight" and would require lots of rudder correction. and it just doesnt look "clean".
any suggestions?
thanks.
Make sure the elevators are moving exactly the same amount at exactly the same time.
An easy way to see this is get to spring type clothes pins and 2 very straight pieces of balsa sticks roughly 20 inches long. Now glue the sticks to the clothes pins. Clip the clothes pins to each elevator and angle them so they meet right behind the rudder. It's important that you clip the pins to the same spot on each elevator halve.
Now slowly move the elevators from full down to full up and watch the sticks. They should remain lined up the whole way through the travel.
If they do then verify lateral balance is OK and if both of those are fine then it could be you have too little throw. Too little throw will not allow the wing to get past the stall point quickly. CG can also effect this to a degree. You could be too nose heavy. The GP Yak seems to have this issue when set to the book CG. Check over in the big CG Yak forum, they did discuss it in there.
Another thing I have seen is entering the wall with the wings not level, huge amounts of aileron or rudder trim or even engine thrust.