Accession Number : AD0881238

Title :   Flight Loads Investigation of CH-54A Helicopters Operating in Southeast Asia.

Descriptive Note : Final rept.,

Corporate Author : TECHNOLOGY INC DAYTON OH

Personal Author(s) : Giessler, F. Joseph ; Nash, John F. ; Rockafellow, Ronald I.

Report Date : JAN 1971

Pagination or Media Count : 554

Abstract : During a structural flight loads program on six CH-54A helicopters operating in the Vietnam theater, 1048 hours of 11-channel flight data were recorded between August 1968 and February 1970. To study the adequacy of a 200-hour data sample, as well as to derive appropriate environmental loads spectra, two sets of valid data, one representing 204 hours and the second 207 hours, were processed and analyzed according to four distinct flight phases, termed mission segments: (1) takeoff and ascent; (2) maneuver; (3) descent, flare, and landing; and (4) steady state. Data are presented in the form of time and occurrence tables, histograms, and exceedance curves. These data indicate the time spent in the mission segments and parameters ranges; the number of peak parameter values occurring in the ranges of the given parameter, during each of the mission segments, and in the ranges of one or more related parameters; and the time to reach or exceed given maneuver and gust normal load factors. The analysis of the two sets of data presentations revealed that the two samples differed little and compared closely in their distribution of the flight data. (Author)

Descriptors :   *LOADS(FORCES)), (*HELICOPTERS, (*AERODYNAMIC LOADING, HELICOPTERS), TRANSPORT AIRCRAFT, SOUTHEAST ASIA, FLIGHT, TABLES(DATA).

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE