Accession Number:

AD0725591

Title:

Model Studies of Helicopter Tail Rotor Flow Patterns In and Out of Ground Effect

Descriptive Note:

Final technial rept.

Corporate Author:

OCEANICS INC PLAINVIEW NY

Personal Author(s):

Report Date:

1971-04-01

Pagination or Media Count:

90.0

Abstract:

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.

Subject Categories:

  • Helicopters
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE