A study was conducted using the comprehensive analysis CAMRAD II to explore performance enhancements to large rotorcraft. The aircraft considered were a 125 foot diameter six-bladed rotor helicopter and an 85 foot diameter four-bladed rotor tilt rotor. The objectives were to reduce power required and increase maximum lift. The effects of improved airfoils and active controls were investigated. Airfoils with higher maximum lift and with reduced drag were investigated. Results showed a moderate improvement in the maximum lift capability for the helicopter and a large improvement for the tilt rotor. For the helicopter, 2/rev individual blade control resulted in modest power savings in cruise flight, which increased with control amplitude and forward speed. The optimum phase for the individual blade control was relatively insensitive to both amplitude and forward speed. The influences of active twist, increased chord, increments in airfoil properties, and tilt rotor tip extensions were also investigated.
Advanced Rotor Aerodynamics Concepts with Application to Large Rotorcraft
AHS Aerodynamics, Acoustics, and Test and Evaluation Specialists Conference ; 2008 ; San Francisco, CA, United States
2002-01-23
Conference paper
No indication
English
Springer Verlag | 2023
|Rotorcraft Acoustics & Aerodynamics
Online Contents | 1997
NTIS | 1990