Jack; Are you the same Jack who used to fly DF at Mile Square Park with Harry Wood?

JohnMac; I received an email notice that you replied to the "Larger Electrics" thread, but I didn't find your post. Funny, the subject of flaperons came up recently in the "Open Design" thread. These threads are in the "Aerodynamics" forum.

My experience with flaperons is similar to yours, and I advised "Q" to use only about 20 degrees flap deflection with full-span flaperons. First time I tried flaperons on my larger electric-powered plane I found they would cause a tip stall if you tried to turn. Fortunately I tried them with enough altitude to recover. Now I only deploy them on final.

My newest plane has flaperons with tip plates ("tipplets"). We'll see if the tipplets affect the flaperon characteristics. I've flown it twice, and used only a little flap deflection on final. Soon I'll try a turn with flaps down, but you can be sure I'll do that about three mistakes high.

Here's a link to a photo of my "M3-E":

http://www.rcuniverse.com/gallery/sh...t=1&thecat=500