ORIGINAL: jester_s1
Rodney- I've heard that too about making the top wing lower incidence than the bottom. Do you have any explanation as to why it makes it track better? I know that many swear by doing it, but I can't understand why it would work better than the other way. Also, how are stall responses when the top wing is lower incidence than the bottom?
I can not give you a technical reason, just that trial and error has proven it to me. Perhaps an aeronautical engineer might be able to. I think it is because the wings, being in close proximity (less than on chord length separation) makes the air flow different than if a single wing were being used. I have not found it detrimental in so far as stalling is concerned. I always want to be able to enter a true spin from a stalled attitude using only elevator and rudder (no aileron inputs) and all my bipes will do that. I also tinker with the CG location so that I need very little down elevator to maintain level inverted flight.