Accession Number:

ADA022254

Title:

Representative Engine Power Data for Army Helicopters.

Descriptive Note:

Final rept. 1 Jul-1 Sep 75,

Corporate Author:

TECHNOLOGY INC DAYTON OHIO INSTRUMENTS AND CONTROLS DIV

Personal Author(s):

Report Date:

1976-02-01

Pagination or Media Count:

36.0

Abstract:

With rapid engine torque pressure changes as the factor of prime interest, some 700 hours of multichannel oscillogram data recorded on AH-1G and UH-1H helicopters while they operated in Southeast Asia and Alaska were reviewed with 5.4 hours selected and processed to obtain engine power data suitable for the development of criteria for future low-cycle fatigue testing of advanced helicopter engines. After short and medium flight lengths were determined, a representative flight was selected for each of seven categories of aircraft type, geographical location, mission type utility, combat assault, and combat support, and flight length. Four parameters in the seven flights were processed engine torque pressure, main rotor speed, outside air temperature OAT, and pressure altitude. The intermediate rated power IRP limit was computed as a function of OAT and altitude and the engine shaft horsepower was derived from the rotor speed and torque pressure to yield the percent IRP. Data presentations include histograms of the flight length frequency distributions time histories of the percent IRP, altitude, and OAT histograms of the percentage of time in percent IRP ranges and a tabular summary of the 13 torque excursions in the seven flights and related data.

Subject Categories:

  • Helicopters
  • Attack and Fighter Aircraft
  • Manufacturing and Industrial Engineering and Control of Production Systems
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE