MinnFlyer is right, I have a skysport six and have used Flapperons, however are you building a WM Fairchild, if so, dont use flapperons you dont need them and you run the risk of stalling the aircraft on landing. I have a fairchild PT-26 with a Saito 65 four stroke and a skysport 6, it all works very well without flapperons. However watch those wheels on grass, always check the operation of the retracts before each flight and never use the recever battery to power them

hope this helps

Cscape