Rotor driven auxiliary power apparatus and method

摘要

Apparatus and methods is used for controlling yaw of a rotorcraft in the event of one or both of low airspeed and engine failure. A yaw propulsion provides a yaw moment at low speeds. The yaw propulsion device may be an air jet or a fan. A pneumatic fan may be driven by compressed air released into a channel surrounding an outer portion of the fan. The fan may be driven by hydraulic power. Power for the yaw propulsion device and other system may be provided by a hydraulic pump and/or generator engaging the rotor. Low speed yaw control may be provided by auxiliary rudders positioned within the stream tube of a prop. The auxiliary rudders may one or both of fold down and disengage from rudder controls when not in use. A power take-off engages a rotor and is engaged in response to detecting a loss of engine power.

主权项

1. A rotorcraft comprising:
an airframe; an engine connected to drive the rotorcraft through the air; a rotor rotatably mounted to the airframe and rotatable about an axis of rotation; a power take-off selectively uncoupling from the rotor and coupling to the rotor to be driven by the rotor, the power take-off including a drive wheel; and a power source connected to receive power through the power take-off and comprising at least one of a hydraulic pump and a generator; a mast extending upward; a shroud surrounding the mast and being fastened to the mast; a flange secured to the shroud; a hub mounted to the mast; a plurality of blades coupled to extend from the hub; and a belt encircling the hub and engaging the drive wheel.