Accession Number:

AD0894530

Title:

Limited High Altitude Performance Evaluation of the HH-53C Helicopter

Descriptive Note:

Final rept.,

Corporate Author:

AIR FORCE FLIGHT TEST CENTER EDWARDS AFB CA

Report Date:

1971-12-01

Pagination or Media Count:

58.0

Abstract:

This limited flight test program defined the hover and takeoff performance of the HH-53C helicopter at high altitude and included an evaluation of the increased tail rotor power provided by a new tail rotor bellcrank. Hover and takeoff performance were satisfactory during high altitude testing. Operating at 105 rotor speed at high altitude, heavy gross weight combinations provided a more rapid response of the aircraft to control inputs than operation at 100 where control response was somewhat sluggish. In addition, it provided increased performance, prevented reaching mechanical control stops from limiting performance and lowered cruise guide readings. The new tail rotor bellcrank increased the HH-53C lift capability approximately 4,500 pounds by preventing tail rotor authority from limiting aircraft performance. A compromise between maximum performance and safety resulted in recommendation of a 35 knot indicated airspeed for takeoff.

Subject Categories:

  • Helicopters

Distribution Statement:

APPROVED FOR PUBLIC RELEASE