Accession Number:

ADA071153

Title:

A Flight Research Investigation of Autorotational Performance and Height-Velocity Testing of a Single Main Rotor Single Engine Helicopter

Descriptive Note:

Final rept. May 1968-Mar 1969

Corporate Author:

ARMY AVIATION ENGINEERING FLIGHT ACTIVITY EDWARDS AFB CA

Report Date:

1976-03-01

Pagination or Media Count:

382.0

Abstract:

Autorotational performance and height-velocity H-V testing were conducted to examine the effects of pilot technique and operating variables on rotor performance and aircraft capability during these maneuvers. Various testing methods were compared and ways to provide the operators with more meaningful information were considered. The testing was conducted by the United States Army Aviation Engineering Flight Activity at Edwards AFB, CA, as well as at a sea-level site near Shafter, CA, and at high-altitude sites in the vicinity of Bishop, CA. The testing was accomplished with a UH-1C helicopter. Test results show that separating the H-V maneuver into entry, dive, flare, and landing phases during tests at a safe height above the ground provided the best evaluation of both aircraft behavior and pilot requirements. The H-V diagram was then developed using a selected technique or criteria in a much safer manner and with reduced flight time. An improved methodology was developed which utilized theory and preliminary flight data to produce H-V diagrams with a reduced testing hazard. A data presentation requirement was developed and a demonstration outline is shown.

Subject Categories:

  • Helicopters

Distribution Statement:

APPROVED FOR PUBLIC RELEASE