Accession Number : AD0704601

Title :   HELICOPTER LIFT-MARGIN SYSTEM. VOLUME I.

Descriptive Note : Final rept.,

Corporate Author : TRANS-SONICS INC BURLINGTON MASS

Personal Author(s) : Westcott,Vernon C. ; Williams,Sidney B.

Report Date : FEB 1969

Pagination or Media Count : 45

Abstract : Helicopter power requirements are generally maximum when hovering out of ground effect (at least for speeds less than 100 knots). Thus takeoff and landing maneuvers are the most critical, since the power requirements may not be clear to the pilot at the time he must make the corresponding decisions. Power deficiencies at takeoff or landing are very hazardous. To maximize safety of takeoff and landing operations, a system has been devised which presents to the pilot his lift margin, a figure which represents the excess weight which could be accommodated under locally-existing barometric-pressure and outside-air-temperature conditions. The system includes two kinds of compensators of which the first corrects available engine torque for ambient conditions and the second makes a similar correction for the ratio of gross weight to required power. (Author)

Descriptors :   (*HELICOPTERS, AERODYNAMIC CHARACTERISTICS), (*LIFT, INSTRUMENTATION), AVIATION SAFETY, AIRCRAFT LANDINGS, TAKEOFF, STALLING, GROUND EFFECT, HELICOPTER ROTORS, TORQUE, FEASIBILITY STUDIES

Subject Categories : Flight Control and Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE