Accession Number : ADD000030

Title :   Helicopter Lift Margin Determining System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Edgerton,Bradford W ; Williams,Sidney B ; Westcott,Vernon C

Report Date : 28 Aug 1973

Pagination or Media Count : 15

Abstract : The patent concerns a systems for determining in flight and continuously indicating to a helicopter pilot the lift margin of his craft. Lift margin is the difference between the maximum available lift and the effective gross weight, both expressed in pounds, and is obtained from the ratio of lift to horsepower and the variation of the relative performance of the engine under ambient conditions. Input parameters of topping torque, hover torque, outside air temperature, static pressure, fuel weight, and rotor speed are both theoretically and empirically derived and combined to obtain maximum available lift and effective gross weight.

Descriptors :   *Patents, *Helicopters, *Flight instruments, Lift, Analog computers, Display systems, Aviation safety, Human factors engineering

Subject Categories : Helicopters
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE