Helicopter Hover Performance Estimation Comparison with UH-IH Iroquois Flight Data.

Abstract

The hover performance of the UH-1H Iroquois has been estimated under a variety of operational conditions using POLAR2, a program based on blade element theory. This program is an improved version of POLAR, a program previously developed at ARL, which did not allow for compressibility effects. The occurrence of these effects in a hovering situation is discussed, and a relationship allowing for such effects has been derived and included in POLAR2. Other improvements, designed to make the program more convenient ot use include the calculation of tail rotor performance together with variables such as tip loss, air density and Lock number which were previously input. The role of the induced velocity factor is also discussed. Finally, comparisons of estimates using POLAR2 and ARDU flight trials data for the UH-1H are presented.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1986
Accession Number
ADA173707

Entities

People

  • A. M. Arney
  • M. J. Williams

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Aircraft Maintenance
  • Aircrafts
  • Altitude
  • Blade Tips
  • Computer Programs
  • Computers
  • Department Of Defense
  • Engineering
  • Ground Effect
  • Helicopters
  • High Altitude
  • Low Temperature
  • Mach Number
  • Momentum
  • Sea Level
  • Tail Rotors

Readers

  • Aerospace Engineering
  • Statistical inference.