Patent ID: 7731121

Claim:
A rotorcraft comprising: a means for lift compounding; and a separate means for propulsion compounding, which is a pneumatic propulsive anti-torque system, comprising: a tail boom disposed at the aft end of the rotorcraft; an engine disposed in the tail boom for providing torque through a drive shaft to a rotor system of the rotorcraft; a fan module disposed in the tail boom and driven by the drive shaft for producing a flow of compressed air through the tail boom; a thrust nozzle disposed at the end of the tail boom for selectively producing anti-torque thrust and forward thrust; a duct system disposed within the tail boom for directing the air flow through the tail boom to the thrust nozzle; adjustable spillage doors disposed near the aft end of the tail boom for selectively releasing excess airflow from within the duct system and for selectively controlling a temperature within the duct system; and wherein the fan module is located in relation to the engine, such that the compressed air flow from the fan module is mixed with exhaust from the engine to cool the exhaust from the engine a plurality of control vanes disposed at the aft end of the tail boom for selectively controlling the anti-torque thrust and forward thrust, the control vanes being configured to pivot about a vertical axis as well as being pivotally connected to the control vanes located adjacently.