<< if a sailplane need to have down elevator to fly level it means the sailplane is tail heavy? luis >> Luis: At the risk of being overly simplistic, I would offer the following: If the balance is correct (or close), it then having to hold or trim in down elevator means that the decalage (sometimes mistakenly called incidence) between the stabilizer and the wing is incorrect. Of course, first try to get the balance where you like to fly it--some flyers like a more nose heavy model, while others like a more neutrally stable model. (Usually, a more neutrally stable model will be a bit harder to fly, but will show thermals better or more easily.) So, get the balance where you like it. If any down or up elevator still remains, then adjust the wing or the stab until the elevator is neutral at the best (or that which you like best) glide angle. Best regards, Bob Sliff RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
