Accession Number : AD0433703


Title :   AN EVALUATION OF THE EFFECTS OF ALTITUDE ON THE HEIGHT VELOCITY DIAGRAM OF A SINGLE ENGINE HELICOPTER


Descriptive Note : Technical rept.


Corporate Author : FEDERAL AVIATION AGENCY WASHINGTON DC


Personal Author(s) : Hanley, William J ; DeVore, Gilbert


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/433703.pdf


Report Date : Feb 1964


Pagination or Media Count : 88


Abstract : The effects of altitude on the height-velocity H-V) diagram for a light-weight, single-engine helicopter were investigated at four selected altitudes (sea level, 4000 ft., 7000 ft, and 10,000 ft.) and three gross weights (2415 lbs., 2650 lbs., and 2850 lbs.). Quantitative and qualitative information was collected to determine how the height-velocity diagram varies with density altitude and also to determine a means of calculating the height-velocity diagrams for various density altitudes from flight test data recorded at one density altitude. Flight test results disclosed a family of curves showing that increases in either density altitude or gross weight incrased either the airspeed or the height above ground required for safe operation. From these empirical curves, linear equations were derived which express the relationship of critical points of the height-velocity diagram of the test helicopter for various gross weights and operating altitudes.


Descriptors :   *HELICOPTERS , *FLIGHT ENVELOPE , VELOCITY , FLIGHT TESTING , ACCELERATION , PILOTS , WIND , TEST METHODS , TERRAIN , HELICOPTER ROTORS , WEIGHT , AIRSPEED , INSTRUMENTATION , AVIATION SAFETY , ROTATION , AIRCRAFT LANDINGS , ATMOSPHERIC DENSITY , LOW ALTITUDE , HEIGHT FINDING


Subject Categories : Aerodynamics
      Helicopters


Distribution Statement : APPROVED FOR PUBLIC RELEASE