Remove Airfoil Remove Center of Gravity Remove Torque
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The Role of Newton’s Third Law in Aviation

Pilot Institute

They are designed with a special shape called an airfoil, which encourages passing air to turn and deflect downward. This is why the typical airfoil shape has a curved top and a flat bottom, especially in slower-speed general aviation aircraft. Newtons Third Law tells us that we need to push air downward to produce an upward force.

Lift 52
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Nothing Small About It

Plane and Pilot

Another advantage of the counter-rotating props is the elimination of torque roll. This is the tendency to dig in the left tip float during takeoff while countering engine torque. The airfoil is a Harry Riblett shape, giving modernized flow separation on the leading edge for a soft stall yet with good lift and drag performance.