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Brian Case wrote:
I don't think the point was that a glider won't stall in a steep turn. I think the point was that in some gliders with the CG far enough forward and a small enough stabilizer, the stabilizer can not produce enough down force when in high G turn to get the wing to the critical angle of attack and thus stall. Limiting the stabilizer/elevator is a well known trick to prevent (or least make it more difficult to stall) stalls if power aircraft, both Ercoupe and Stinson used this trick. Flying glider with an aft CG and/or large stabilizer will definently stall in a steep turn. Other might be made to, but it are more difficult to stall in a turn. I completely disagree with the idea that you need more down force (at any given bank angle, including zero) in order to get a more nose up attitude. This would mean that the wing airfoil is stable, which is not the case except for flying wings. What you need is more elevator deflection, but not because you need more force, rather because the airflow at the tail plane has a different direction when the attitude is more nose up, needing a higher deflection even to produce a lower force. If this would not be the case, the whole aircraft (wing + taiplane) would be unstable. |
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