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Low sonic boom shock control/alleviation surfaceA sonic control device that reduces the effects of shock waves generated by an aircraft traveling at supersonic speeds. The control device includes a control surface located at or near the nose section of the aircraft. The position of the control surface can be moved between a retracted position and an extended position. When in a deflected position, the control surface increases the air pressure at the nose section. The increase in air pressure at the nose section decreases both the pressure amplitude and the slope of the overall shock wave as the wave travels toward the ground. Additionally, the deflection of the control surface may induce a downward directed pressure increase which creates less of a drag penalty than a truly blunt nose. When shock control is not desired, the control surface is moved back to the retracted position to reduce the drag on the plane. The moving control device allows a supersonic aircraft to efficiently travel above both land and water.
Document ID
20080004589
Acquisition Source
Langley Research Center
Document Type
Other - Patent
Authors
Morgenstern, John M
Date Acquired
August 24, 2013
Publication Date
April 21, 1998
Subject Category
Aerodynamics
Report/Patent Number
Patent Number: US-PATENT-5,740,984
Patent Application Number: US-PATENT-APPL-SN-310495
Funding Number(s)
CONTRACT_GRANT: NAS1-19345
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-5,740,984
Patent Application
US-PATENT-APPL-SN-310495
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