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Deployment and performance characteristics of 1.5-meter supersonic attached inflatable deceleratorsAttached-inflatable-decelerator (AID) canopies fabricated from lightweight Nomex cloth and tapes were deployed in a supersonic stream from the base of a 140 deg conical aeroshell. Characteristics of the deceleration system were obtained over a wide range of Mach number, dynamic pressure, and pitch angle. All models deployed rapidly by ram air and experienced only mild deployment shock loads. Steady-state drag coefficients as high as 1.3 were obtained in the supersonic stream and were relatively insensitive to Mach number, dynamic pressure, and pitch angle. All models were free of fluttering motion. Results also showed that the AID is aerodynamically more efficient without a burble fence in a supersonic stream. Though measured meridian-tape loads were higher than those predicted by theory, the ram-air deployment rates and steady-state drag coefficients were in good agreement with theory. These results indicate that the AID is a stable, efficient decelerator in a supersonic stream and its performance is readily predictable.
Document ID
19740020295
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Bohon, H. L. (NASA Langley Research Center Hampton, VA, United States)
Sawyer, J. W. (NASA Langley Research Center Hampton, VA, United States)
Miserentino, R. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1974
Subject Category
Structural Mechanics
Report/Patent Number
NASA-TN-D-7550
L-9402
Accession Number
74N28408
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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