Accession Number : ADA316870

Title :   Full-Scale S-76 Rotor Performance and Loads at Low Speeds in the NASA Ames 80- by 120-Foot Wind Tunnel. Volume 2.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Shinoda, Patrick M.

PDF Url : ADA316870

Report Date : APR 1996

Pagination or Media Count : 938

Abstract : Detailed dynamic loads data are divided into two sections; thrust sweep data and speed sweep data. Data for both forward flight thrust sweep conditions and speed sweep conditions with minimized flapping trim are presented in tabulated form in this appendix. Thrust sweep data runs are grouped in terms of increasing rotor advance ratio and shaft angle-of-attack, os. Speed sweep data runs are grouped in terms of increasing shaft angle-of-attack, a5, and thrust condition. For each of the measurements, the time-averaged mean, root-mean-square, one-half peak-to-peak value (absolute maximum minus the absolute minimum divided by 2), and the first twenty harmonics expressed in terms of Cosine and Sine components are presented. Definitions of the measurements that are presented in this section are shown below. Identification of test conditions and its location within this appendix are presented following these definitions.

Descriptors :   *HELICOPTER ROTORS, *WIND TUNNEL TESTS, *DYNAMIC LOADS, RATIOS, HARMONICS, ANGLE OF ATTACK, TIME, IDENTIFICATION, SHAFTS(MACHINE ELEMENTS), MEAN, THRUST, SINE WAVES.

Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines
      Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE