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Depending on design, airfoils used in general aviation, stall at angles of attack between 16 to 18 degrees. The power on stall simulates the takeoff and departure situations, and the power off stalls the approach and landing conditions. At the normal approach speed, lower the nose to the approach pitch attitude.
The wings are designed with an airfoil shape, curved on the top and flatter on the bottom, creating a pressure difference when air flows over them. Each rotor blade acts as an airfoil, and as it rotates, it moves air over its surface, generating lift. This pressure difference produces lift, allowing the aircraft to ascend.
But it was apparent the smallest Grumman flying boat was too small and full of quirks—the cabin door won’t open if the flaps are down, for example—to justify something approaching a direct copy. Another advantage of the counter-rotating props is the elimination of torque roll.
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