What is this called?

[Murocflyer]

I've seen this before during my research, but can't seem to put my finger on it and not sure if I'm using the correct term.

I've read that it is better to limit the aileron travel up or down to make a smoother turn/roll. In other words, when making a right turn, the right aileron either goes up farther or not as far as the left aileron goes down. Does anyone know which is which and what is it called that I am trying to correct by doing this?

Thanks,

Frank

[Murocflyer]

After surfing for a while I think I have found it. It is called aileron differentail and you should have more up than down travel.

Frank

[JetPlaneFlyer]

After surfing for a while I think I have found it. It is called aileron differentail and you should have more up than down travel.

Frank

Yes, and it's there to prevent adverse yaw, which is caused by the downgoing aileron creating extra drag which tends to yaw the model in the opposite direction to the desired turn. Adverse yaw tends to be worse when flying slowly at high angles of attack. I've seen models that turned strongly in the opposite direction to aileron input due to adverse yaw. The models I've seen that were worse effected had 'high lift' airfoils that have a 'flattish' or 'undercambered' profile.

[Texas Buzzard]

Back before we used the term "differential ailerons" I had my first trainer type , a Lou Andrews "Explorer". A 60"w.s. single channel ship. When I first got a multichannel radio, an E.K. 4-channel I added elevator to the rudder. Later I added strip alerons so now I had a full 4-channeled (REAT) plane like the rich boys had.

This plane would actually fly free flight with no control input for it had about 7 degrees of dihedral per wing panel.....it was first a single channeled plane, remember?

Now to the point of all of this. *I heard some of the guys saying that they could turn with just aileron input with a small amt. of up elevator. Since I was a Private Pilot I had used some rudder input when I applied ailerons to turn and it worked fine. But then when I tried to turn using ailerons only my plane would turn the opposite way from the aileron input. Left aileron caused the plane to skew off to the right but a tad of left rudder corrected it into the left turn. What was happening was that the right aileron was going down the same amount that the left aileron was going up. (No differential!)

So for several years I used coordinated rudder/aileron turns. Then one day I saw in a model magazine a fix that produced differential in aillerons. Simple. Instead of connecting the pushrods exactly opposite each other on the servo wheel you connected the pushrods one hole to the rear. Upon applying left aileron the left aileron would go up significantlly more than the right aileron went down. With an aileron hanging below the wing it developed more Drag than the other aileron which was up. So I got rid of the adverse yaw in a few years. This was during the late 1960's.