Pilot Institute

APRIL 12, 2025

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

Lift Torque Thrust Aileron 52

Vintage Aviation News

DECEMBER 5, 2024

In order to minimize the effects of torque on the aircraft, the Shiun was equipped with the MK4D variant of the Kasei engine, which was modified to accept contra-rotating two-bladed propellers. Additionally, the Shiun incorporated a laminar flow airfoil to reduce drag.

Drag 52

Drag Stability Torque Airfoil 52

Plane and Pilot

OCTOBER 3, 2024

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.

Airplanes 77

Airplanes Rudder Knot Aileron 77