momo95:
Originally Posted by
eckhard
I don't think that any 'plane (... ...) can fly with the CG aft of the CP.
Do you insist that CP is forward of CG?
Anyways, the nose-down moment of the arm between CP and CG behind is not the sole reason we need downwards force on the tail.
On top of that is the aerodynamic moment, again nose down, of the wing itself. It will be most prominent with full flaps extended.
To counteract that in an effective manner some tails are designed with upside down camber. This is more typical for non-moving horizontal stabilizers, especially in combination with high-wing design
without a T-tail.
