Model Studies of Helicopter Tail Rotor Flow Patterns In and Out of Ground Effect
Final technial rept.
OCEANICS INC PLAINVIEW NY
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Water tunnel studies of a model helicopter which entailed a visualization of the main and tail rotor wakes, the inflow patterns, and their subsequent interactions as the wind velocity and wind heading were changed resulted in a significant gain in knowledge ultimately applicable to direction control of helicopters. Of significant interest was the impingement of the main rotor wake with a ground plane, its subsequent spreading outward in a radial manner and the roll-up of the wake into a standing vortex at the outer edge of this radial expansion of the wake.
- Fluid Mechanics