once again i return to bathe in the light of your wisdom..............

hope you can help guys. some of you may recall i'm building a large'ish (9 footer) old timer cabin model (my design) and i have chosen with your help a Gottigen 501 airfoil to lift her.

I'm trying to get a ball park idea of what angle to set the tailplane at. My current best guess is to set tyhe tailplane parallel to the airfoil's chord line (drawn from the TE to the foremost part of the LE).

My issue is this........... i know that the undercamber will act similarly to having a few degrees of down flap in terms of causing the model to pitch up a bit, clearly if she rears up violently on her first takeoff i could lose the model (or it would be at least difficult to control). so i need to work out how much, if any, positive incidence is needed.

The CG should, by my guess, end up around the 35-45% mark ( a bit further back than a standard trainer model).

Bruce Mathews had an old timer design with an undercambered wing - if you're reading this Bruce, would you kind and mind telling me you incidence setting? I'd hate to get her airborn only to find the entire tail needed cutting free and re-setting at a new, lower angle.

reagards Rick