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Compression Pylon Reduces Interference DragNew design reduces total drag by 4 percent. Pylon reduces fuselage/wing/pylon/nacelle-channel compressibility losses without creating additional drag associated with other areas of pylon. Minimum cross-sectional area of channel occurs at trailing edge of wing. Velocity of flow in channel always nearly subsonic, reducing compressibility losses associated with supersonic flow. Flow goes past trailing edge before returning to ambient conditions, resulting in no additional drag to aircraft. Designed to compress flow beneath wing by reducing velocity in this channel, thereby reducing shockwave losses and providing increase in wing lift.
Document ID
19890000373
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Patterson, James C., Jr.
(NASA Langley Research Center, Hampton, VA.)
Carlson, John R.
(NASA Langley Research Center, Hampton, VA.)
Date Acquired
August 14, 2013
Publication Date
July 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 7
ISSN: 0145-319X
Subject Category
Mechanics
Report/Patent Number
LAR-13777
Accession Number
89B10373
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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