DTIC AD0784594: Investigation of the Effects of Blade Structural Design Parameters on Helicopter Stall Boundaries

by: Defense Technical Information Center

Publication date: 1974-05-01

Topics: DTIC Archive, Blackwell, R H, UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV, *HELICOPTERS, *ROTOR BLADES, *STALLING, AERODYNAMIC CHARACTERISTICS, AIRFOILS, FLUTTER, RESONANT FREQUENCY, VIBRATION,

Collection: dticarchive; additional_collections

Language: English

An experimental and analytical study was conducted to determine the effects of blade structural design parameters on the stall-related operating boundaries of helicopter main rotors. Emphasis was placed on the effects of blade torsional properties on the buildup of vibratory control loads in stall. The analytical methods used in the study were evaluated through correlation with data for two full-scale rotors and data obtained on a two-dimensional airfoil system whose torsional dynamics simulated those of a rotor blade.