Accession Number : ADA184574

Title :   Wind-Tunnel Evaluation of an Advanced Main-Rotor Blade Design for a Utility-Class Helicopter.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER

Personal Author(s) : Yeager,William T , Jr ; Mantay,Wayne R ; Wilbur,Matthew L ; Cramer,Robert G , Jr ; Singleton,Jeffrey D

PDF Url : ADA184574

Report Date : Sep 1987

Pagination or Media Count : 38

Abstract : An investigation was conducted in the Langley Transonic Dynamics Tunnel to evaluate differences between an existing utility-class main-rotor blade and an advanced-design main-rotor blade. The two rotor-blade designs were compared with regard to rotor performance, oscillatory pitch-link loads, and 4-per-rev vertical fixed-system loads. Tests were conducted in hover and over a range of simulated full-scale gross weights and density altitude conditions at advance ratios from 0.15 to 0.40. Results indicate that the advanced-blade design offers performance improvements over the baseline blade in both hover and forward flight. Pitch-link oscillatory loads for the baseline rotor were more sensitive to the test condition than those of the advanced blade was larger than that produced by the baseline blade at all test conditions.

Descriptors :   *ROTOR BLADES(ROTARY WINGS), WIND TUNNEL TESTS, HELICOPTER ROTORS, FLIGHT TESTING, HOVERING, TRANSONIC WIND TUNNELS, AERODYNAMIC CHARACTERISTICS, AEROELASTICITY

Subject Categories : Helicopters
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE