Ok....so when we activate the flap it neeed to pitch up instead of down.....and we mix the amount of down elevator during flight...is that all.....about your chipmunk Tim....what do you do with the flap....just install a servo and leave it....how to lock up the flap if i don't need it....in my place which I have seen ...just glue a piece of balsa to the wing thats it....I don't like it this...way ...any other suggesstion.....