Generalized helicopter rotor performance predictions.

Abstract

The Generalized Rotor Performance (GRP) program is a computer program designed for calculating forward flight performance of a helicopter rotor system at a specific flight condition. It can be used to evaluate either an articulated or a hingeless single rotor system in forward flight or in a wind-tunnel test. The program was originally designed by the Sikorsky Aircraft Company and purchased by the United States Navy. The goals of this thesis were (1) to reinvestigate the theory and logic used in the program, (2) to add selected desirable features to the program, (3) to produce a much needed Users' Manual, and (U) to run an analysis comparing the program's calculated results against manufacturer's data. These goals were accomplished and the results of the analysis indicated that the program produces highly accurate results within the normal cruise range of a modern helicopter.