rolls right
 

Hi all I have a sport trainer that want to roll right I have the trim set all the way to the left and it is still not enough ive checked the tail and it is stright and the ailerons are even with the wing on drooping the rear stabilizer looks level so I am open to any help michael

RE: rolls right
 

Check for wing twist. This is easy on a flat-bottomed trainer wing by rubber-banding a dowel (or arrow, fish-rod, etc) to the same point on each wing panel and looking at them from the side to see if they are even. Check at the root and again at the tips.

If the trim isn't enough you have to adjust the linkage (which you should do anyway rather than rely on trim or sub-trim settings).

Balance the model laterally by supporting the prop-shaft and a rudder hinge with thread. If one wing always drops add weight on the end of the opposite wing. This shouldn't be enough to upset a trainer unless it's really bad.

RE: rolls right
 

Post a picture if you can. Here are a couple things to check.

Hold the wing and look down it from tip to tip. You are looking for a warp. Laying it on a flat surface and measuring the opposite wing front and back will also reveal any warps.

Also, balance the wing in the center and see if the right side drops. If it does, add weight to the left wing tip to balance.

I think more likely you will find a warp. These can usually be removed by twisting the wing in the opposite direction, and heating the covering to remove the wrinkles you will see.

Keep us posted.

RE: rolls right
 

are both wings set to zero also sounds like one wing is off?

RE: rolls right
 

ok checked for wing warp it has none also checked the and measured the stabilizer it is real close iam thinking the wing saddle might be off if that is not it guess i will adjust the left aileron up a little i will let you all know next weekend michael

RE: rolls right
 

OK, also check the rudder. A high wing, flat bottom wing, with trainer-like dihedral, will bank on it's own when turned. Check to see if your rudder is straight.

Also check the engine thrust offset. You will probably see some right and down thrust. If you have a small engine on her, this thrust may be too much for the engine to overcome in torque.

A horizontal stab wrap can also cause roll. Check for that as well.

Move the control rod to horn connection on the ailerons one hole closer to the wing to increase the throw on ailerons. This should give you enough throw to overcome your roll condition, but does not address the cause. It may make slow flight with low power settings, as in landing, a little more challenging.

RE: rolls right
 

cant move the linkage its a single servo as far as engine thrust it has right thrust and a little down thrust its a 60 size trainer and it has a 60 on it i noticed a little slop in the ailerons so i might go with duel sevros iam thinking that the slop is the problem when trimming cause if i trim it to the left the slop in the ailerons the wind force is pushing the ailerons down and not holding the trim setting what do you think michael

RE: rolls right
 

Where I meant for you to move the connection is on the aileron horns. This should be possible no matter how many servos are used. Slop is most definitely not good in any connection. This slop may be from the sheaths (outer tubes) moving. You may try gluing them where they exit the wings at both ends.

RE: rolls right
 

You can't make an adjustment by turing a threaded connector on either end in or out? That might be a problem as even with single servo ailerons yu have to be able to set the neutral point independantly. Usuallt with a threaded clevis at one end.