A hybrid composite blade, utilizing interleaved S-glass/epoxy and graphite/epoxy laminae, has been developed as part of a program to study helicopter flight performance characteristics attainable with circulation control aerodynamics. Lift control of a circulation control rotor (CCR) blade is accomplished by varying the flow of compressed air through a full-span trailing edge slot, rather than by pitch change. In addition to improved and simplified flight control, this concept promises lower maintenance, reduced vibration levels and enhanced aerodynamic efficiency versus conventional rotors. However, the CCR concept also introduced new blade design constraints arising from the interal air ducting requirements and trailing edge slot opening, and from compressor heating of the control air. Additionally, unique dynamic stability requirements dictate an unusually high blade torsional stiffness coupled with conventional bending mode natural frequencies.
A hybrid composite helicopter main rotor blade employing pneumatic lift control
Ein Rotor aus Verbundwerkstoff fuer Hubschrauber mit pneumatischer Auftriebsteuerung
NEW HORIZONS. MATERIALS AND PROCESSES FOR THE EIGHTIES. 11TH NAT. SAMPE TECHN. CONF. ; 11 , Nov ; 840-849
1979
10 Seiten, 9 Bilder, 3 Tabellen, 8 Quellen
Conference paper
English