aileron differential?

[fredo]

	Quote: Originally Posted by zoomer260
	I'm a dummy but don't you just have to "fly the Plane" to correct some things? I've met good pilots ( way better than I ever hope to be ) that used rudder and elevator to correct everything before they mixed out any of it. Sometimes you still have to fly the plane.

You are correct, somehow you have to fly the plane but what we are trying to achieve here(specialy for aerobatic planes) is to set the plane that it has a neutral feel in all aspects wherever you point it. You also want the rolls to be axial. Of course you are still using all inputs to get through the maneuver but nowhere near you have to fight the plane as much as if it wasn't trimmed. Most planes have some inherited aerodynamic defects that should be fixed by using mixes in your radio. If you don't have spend too much time correcting untrimmed plane your workload will become much less and you can concentrate flying the maneuvers (whatever that is)

[Ryguy]

What really has me bamboozled was I thought all foamies inherently suffered dramatically from the effects of adverse yaw much greater than that of larger planes, just because of their unique lack of an airfoil and extreme light wing loadings. However, my Fancy Foam Xcalibur shattered this law for me, you can roll forever and it will go straight as an arrow. I wish I knew why this design didnt suffer the effects that every other foamy I've flown has, so that I could apply that to my other planes.

[Ryguy]

Here are some pics I had requested with the Xcalibur.
http://image.rcuniverse.com/forum/up...63/Xv63930.jpg
http://image.rcuniverse.com/forum/up...63/Sn40567.jpg
The only think that comes to mind about it is that possibly the foam cross braces are the culprit. Talking with Mike Hammel, its designer, the idea behind them was an easy way to add wing area both on the wing and on the side without adding additional weight and to increase stiffness. Maybe an addidional benefit is they correct otherwise wild airflow around the wing during fast rolls and work to alleviate the causes of the adverse yaw.

[skyrocket]

	Quote: Originally Posted by fredo
	I think this is the reason why they invented top hinged ailerons (sometimes called differential ailerons).The down aileron disappears in the cavity of the wing therefore reduces its area and becoming less "draggy" that way you can have same travel on both ailerons. This is the idea right? Unfortunately it somehow doesn't seem to work on Composite ARF planes. It seems like the resulting effect is too much therefore they need opposite differential. More down travel than up. Strange. Does anyone know why is it? My opinion is, it probably takes a lot of calculating,testing and designing the right profile.

I have just crashed my flash due to the wing tucking under on a turn, ail movment was 12mm which is not a lot. this was not the first time and have read your article above i think you are right to much up compared to down i think opposite differential is needed