Aerodynamic Effect of Strakes on Two-Dimensional Tail Boom Models of OH- 58A and OH-58D Helicopters

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Abstract:

During hover, helicopters experience significant aerodynamic forces on the tail boom caused by the wakes of the main and tail rotors and by crosswinds. These effects were investigated in the Langley 14- by 22-Foot Subsonic Tunnel on large-scale two-dimensional tail boom models with cross sections representative of the U.S. Army OH-58A and OH-58D helicopters. The effects of longitudinal strakes attached to the models were also investigated. The results with the strakes installed showed a significant improvement at conditions representative of right sideward flight by reducing the side force on the booms. Calculations indicated a 5- to 6-percent savings in tail rotor power. An increased download on the booms was noted because of the strakes.

Author(s):
Crowell, Cynthia A. ; Kelley, Henry L.
Author Organization(s):
NATIONAL AERONAUTICS AND SPACE ADMIN LANGLEY RESEARCH CENTER HAMPTON VA
Descriptive Note:
Technical memo.,
Pagination:
0034

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NASA-16842, NASA-TM-4248
Project Number(s):
1L162211A47A
Monitor Series:
TM-4248, TR-90-B-010, NASA
 Subject Terms
Joint Capability Areas:
JCA_1.1_Force Management; JCA_1_Force Support; JCA_5_Command and Control; JCA_6_Net Centric
Modernization Areas:
Fully Networked C3
Communities of Interest:
Air Platforms
Descriptor(s):
*HELICOPTERS, CROSSWINDS, TWO DIMENSIONAL, LOADS(FORCES), CROSS SECTIONS, AERODYNAMIC FORCES, WIND TUNNEL TESTS, WAKE, POWER, SIDES, FLIGHT MANEUVERS, STRAKES, HOVERING, BOOMS(EQUIPMENT), TAIL ROTORS, AERONAUTICAL BOOMS, MODELS, TAIL ASSEMBLIES
Field(s)/Group(s):
Aerodynamics, Helicopters
Keyword(s):
ANTITORQUE SYSTEMS, ALTITUDE CONTROL SYSTEMS, H 58 AIRCRAFT, PE62211A
Report Date:
1990 Dec 01