Investigation of Aeroelastically Adaptive Rotors.

Abstract

Basic principles of aeroelastically adaptive rotor systems have been investigated by wind tunnel test and theory. These are helicopter rotor systems in which dynamic blade twist is enhanced and managed to extend rotor operating limits to higher lifts and advance ratios. In wind tunnel testing, dynamic twist was induced in blades of relatively low torsional stiffness using two design features shown by theoretical analysis to have significant potential: airfoil pitching moment and blade planform sweep with the sweep apex near midspan. Effects on trim flying qualities, fatigue loads, and aerodynamic efficiency were measured. Theory was used to explore specific design applications and to assess potential for productivity improvement. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
May 01, 1976
Accession Number
ADA042083

Entities

People

  • Frank J. Tarzanin Jr.
  • Glidden S. Doman
  • John Shaw Jr

Organizations

  • Boeing Rotorcraft Systems

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Airfoils
  • Airframes
  • Attenuation
  • Control Systems
  • Detection
  • Frequency
  • Helicopter Rotors
  • Load Distribution
  • Physical Properties
  • Resonant Frequency
  • Side Effects
  • Standards
  • Vehicles
  • Waveforms
  • Wind Tunnel Tests
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Aerodynamics/Aeronautics.