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Dynamic Stability and Control Problems of Piloted Reentry from Lunar MissionsA fixed-base simulator investigation has been made of stability and control problems during piloted reentry from lunar missions. Reentries were made within constraints of acceleration and skipping, in which the pilot was given simulated navigation tasks of altitude and heading angle commands. Vehicles considered included a blunt-face, high-drag capsule, and a low-drag lifting cone, each of which had a trim lift-drag ratio of 0.5. With the provision of three-axis automatic damping, both vehicles were easily controlled through reentry after a brief pilot-training period. With all dampers out, safe reentries could be made and both vehicles were rated satisfactory for emergency operation. In damper-failure conditions resulting in inadequate Dutch roll damping, the lifting-cone vehicle exhibited control problems due to excessive dihedral effect and oscillatory acceleration effects.
Document ID
19980227762
Acquisition Source
Headquarters
Document Type
Other - NASA Technical Note (TN)
Authors
Moul, Martin T. (NASA Langley Research Center Hampton, VA United States)
Schy, Albert A. (NASA Langley Research Center Hampton, VA United States)
Williams, James L. (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1961
Subject Category
Aircraft Stability And Control
Report/Patent Number
L-1764
NASA-TN-D-986
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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