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Wind-tunnel static and free-flight investigation of high-angle-of-attack stability and control characteristics of a model of the EA-6B airplaneAn investigation was conducted in the Langley 30- by 60-Foot Tunnel and the Langley 12-Foot Low-Speed Tunnel to identify factors contributing to a directional divergence at high angles of attack for the EA-6B airplane. The study consisted of static wind-tunnel tests, smoke and tuft flow-visualization tests, and free-flight tests of a 1/8.5-scale model of the airplane. The results of the investigation indicate that the directional divergence of the airplane is brought about by a loss of directional stability and effective dihedral at high angles of attack. Several modifications were tested that significantly alleviate the stability problem. The results of the free-flight study show that the modified configuration exhibits good dynamic stability characteristics and could be flown at angles of attack significantly higher than those of the unmodified configuration.
Document ID
19920016033
Document Type
Technical Publication (TP)
Authors
Jordan, Frank L., Jr. (NASA Langley Research Center Hampton, VA, United States)
Hahne, David E. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1992
Subject Category
AERODYNAMICS
Report/Patent Number
L-16813
NAS 1.60:3194
NASA-TP-3194
Funding Number(s)
PROJECT: RTOP 505-61-71-07
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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