"if you have to add washout, you can just set both ailerons in a slight up position, kind of like spoilers."

mmmdowning,

Stop!!! Don't add UP aileron! It will have the opposite affect of "washout" which will provide poor flight characteristics. Adding UP aileron will induce unnecessary drag as well. Washout is a slow speed characteristic. This is a racing plane! You won't win the race from England to Australia with induced drag.

I'm sure you are aware washout is to ensure lateral control about the longitudinal axis (roll) at a few knots above stall speed. This feature is basically to facilitate wings level stalls and landings. Washout is to twist the wing from center to tip with trailing edge up, while maintaining specified camber. By placing the ailerons in the UP position you will in effect create an upside down "under-camber." Bad ju-ju!

Spoilers do just that, spoil lift during descent. Upon landing and usually with additional wing panels lift dump is provided to put weight on the wheels. Chances are, if you are on final approach for landing and prior to flare you have the spoilers deployed take pictures because the resulting end will make for some neat "shouldn't have done that" photo's." Gliders and factory test flights excluded.

The DH 88 wing is fully sheeted so warping the wing is out of the question. Have you checked to see if maybe they didn't build it with washout? Probably have.

Good luck, Randy