Variable pitch screw with constant speed, three-bladed with plastic blades. That is, from the cockpit the pilot moving the VISH lever, only changes the setting of the regulator. And the screw, changing the angle of installation of the blades, keeps the given revolutions. Drive VISH from the hydraulic system of the aircraft. The leading edge of the blades is 1/3 of the end of the blade and has a protective polyurethane coating. A special requirement for the screw is low noise. Due to the good aerodynamics of the airplane, the noise level from the flow is insignificant.
