Accession Number : AD0738203

Title :   Advanced-Geometry, Glass-Fiber-Reinforced Plastic Rotor Blade Test Program

Descriptive Note : Final technical rept. Jun 1967-Feb 1971

Corporate Author : BOEING VERTOL CO PHILADELPHIA PA

Personal Author(s) : Hoffstedt, Donald J

PDF Url : AD0738203

Report Date : Sep 1971

Pagination or Media Count : 473

Abstract : The blade design used S-glass reinforced epoxy, a mechanically trapped and bonded titanium root end attachment, and aerodynamic contours employing advanced airfoils, thickness taper, and planform taper. Fiberglass tooling was successfully employed, and fabrication and quality assurance techniques were developed for the prototype quantity of 12 rotor blades. Static and fatigue tests were conducted for both rotor blade elements and full-scale structure, and whirl test demonstration was completed without encountering significant problems. Exploratory flight testing was performed on a CH-47C prototype instrumented aircraft used as a 'test-bed'. Structural envelope improvements in gross weight, forward speed, and altitude were demonstrated, due in part to improvement in moment-stall-triggered rotor system response as compared to conventional metal blades. The results have demonstrated the feasibility of using composite materials for primary members in helicopter rotor blades of nonuniform geometric characteristics.

Descriptors :   *AERODYNAMIC CONFIGURATIONS, *REINFORCED PLASTICS, *ROTOR BLADES(ROTARY WINGS), AERODYNAMIC CHARACTERISTICS, COMPOSITE MATERIALS, EPOXY RESINS, EXPERIMENTAL DESIGN, FEASIBILITY STUDIES, FLIGHT TESTING, GLASS TEXTILES, HELICOPTERS, MANUFACTURING, TEST METHODS, TITANIUM

Subject Categories : Helicopters
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE