Lets talk some aero...stab location

[sukhoi26mx]

	Quote: Originally Posted by Baron
	Aside from those mentioned already (wing & stab vertical placement, dihedral), coupling also depends upon cross-sectional shape of the fuselage, fin & rudder geometries, rudder/elevator proximity, vertical and longitudinal CG location, etc. Then if you could (remarkably) balance all these effects throught the range of sideslip angles while maintaining a CG suitable for the type of flying desired, you still have asymmetric prop forces that cause both pitch and yaw moments due to sideslip However, generally speaking for most aerobatic aircraft - holding all other variables constant - a lower wing results in adverse roll (opposite direction of rudder application), higher wing results in proverse roll (same direction of rudder application), lower stab results in positive pitch (nose-up), and higher stab results in negative pitch (nose-down). George Hicks wrote a very interesting piece on his research and thoughts regarding coupling, I think it's on RCU. It's a .txt file attached to a post in the aerodynamics section... very highly recommended reading on a very complex subject matter. -Baron

+1. Good description.