Adverse Yaw

Is an effect on all converntional aircraft using any type aileron for roll control it is most pronounced on high wing aircraft. AY is caused by the fact that the downward moving aileron will produce the more lift than the upward moving one and the byproduct of that is drag and more drag will be produced on that side. The effect of this is the airplane will attempt to yaw about the vertical axis in the opposite direction from which we are attempting to roll or turn. You can watch it any day of the week at any field as trainers fly around and the pilots only using ailerons make turns and the airplane will put its wing down and try to point the nose in the wrong direction. Sorta looks like a drunken sailor trying to get back to his ship.

There are many ways to combat and minimise this but none will completly eliminate it. Thats why for a truly coodinated turn aileron and rudder should be used together. A little rudder in the desired direction will coordinate the turn perfectly. Now do we all use the rudder every time its needed well no, so some of the following will go a long way to minimise the effects particularly with highwing cabin types with lots of dihedral:

One way is by aileron design such a Frieze type airlerons which are seldom used in RC craft because of complexity of the build. Another method method is mechanical aileron differential. What this does is by linkage adjustments it does not allow the downward moving aileron to travel as far as the upward moving aileron therefore less drag to the outside of the turn. Yet another option is to program aileron differential on a computer radio But this will require the use of a servo on each aileron. The last option is to use aileron to rudder mix which many even entry level radios have today. What this does when activated will cause the rudder to move with the ailerons a selected percentage when only the aileron stick is moved but the rudder stick will continue to function and will have the full throw you have programed.

Before I finish just let me say many will belittle the use of this mix as not a manly thing to do. And yes of course most mid, low wing aerobatic type of course its redundant and it should not be used in lieu of learning good piloting technique. How ever some types will benefit enormously by its use, such as my four engine Cadet. Actually Cadets by the use of that mix can be made to have absolutely delightful handling just about better than anything out there for that type of flying.

John