I keep it simple: balsa aileron stock just under 1/2 wingspan long, 1/4" thick. Pin thin edge under trailing edge at wing root, swing thick edge
of aileron stock [1/4"] under trailing edge of wing at wing tip and pin. Complete wing construction, 1/4" washout for full len. of wing.
Depending on desired amt. of washout simply use aileron stock of a different thickness. fredsedno