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630 - SPL - What is the advantage of differential aileron movement?

Question 630 - Principles of Flight (Aeroplane) - SPL - Sailplane Pilot License

The drag of the downwards deflected aileron is lowered and the adverse yaw is smaller
The total lift remains constant during aileron deflection
The ratio of the drag coefficient to lift coefficient is increased
The adverse yaw is higher

Training tests and timed exam simulations SPL - Sailplane Pilot License