Level flight performance tests were conducted on five EH-1X/EH-1H helicopter configurations to determine the change in drag characteristics with the addition of external mission equipment to the standard UH-1H helicopter configuration. Comparison of data from a baseline test configuration with previously published UH-1H and YUH-1H data indicated approximately 8.0 increase in equivalent flat plate area which was attributed to the external mission antennas, low reflective infrared/optical paint, and heat suppression kit with vertical exhaust ejector. Installation of the M-130 chaff/flare dispensers resulted in a further increase in equivalent flat plate area of 5.0 sq ft. Replacing the vertical exhaust ejector with the hot metal plus plume infrared suppressor, including the ALQ-144 countermeasures jammer resulted in a reduction in equivalent flat plate area of 1.5 sq ft. Installation of the direction finding antennas resulted in no measurable increase in drag. Addition of all external mission equipment and the hot metal plus plume exhaust resulted in a total increased equivalent flat plate area of approximately 11.5 sq ft. from the standard UH-1H helicopter.
Airworthiness and Flight Characteristics (A&FC) Test of the EH - 1X/EH - 1H Helicopter Configurations
1984
76 pages
Report
Keine Angabe
Englisch
Aircraft , Helicopters , Flight testing , Level flight , Aerodynamic drag , Electronic equipment , External , Infrared suppressors , Dispensers , Countermeasures , Aircraft antennas , Direction finding , Paints , Surfaces , Airworthiness , Exhaust gases , Ejectors , Heat , Suppressors , Aerodynamic configurations , Aerodynamic characteristics , Aircraft protuberances , Electronic aircraft , H-1 aircraft , EH-1 aircraft , AN/ALQ-144 , M-130 dispensers , Jammers , Surface area , Heat suppressors