rmh,

No doubt drag under certain circumstancescan change the way a plane flies, spoilers, air brakes, drag rudders, etc are all example, as are the drag producing 'fences/spoilers' you see on indoor models. However the drag produced by slight elevator defection is a very small force and as the elevator is usually near the centre line of the plane that tiny drag has no significant effect on the pitch of the plane. Consider the fact that for a typical airfoil lift force is about 50 times greater than drag then you start to appreciate that drag plays a much smaller part than lift in the forcesgenerated by an unstalled airfoil.

I know you have in the past expressed the theory that the tail of a plane controls mainly by drag but you are alone on this one and would need to come up with some pretty solid evidence to convince most people.

in any case i dont think this is relevant to the OP's problem because he didn't say that one model had more elevator deflection than the other.

Steve

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