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Air Cushion Landing System Stability Study

Report Number: AFWAL TR 80-3150
Author: Burton, T. D.
Corporate Author: Washington State University, Department of Mechanical Engineering
Laboratory: Flight Dynamics Laboratory
Date of Publication: 1980-11-01
Pages: 66
Contract: F33615-80-K-3409
Project: 2402
Task: 240201
AD Number: ADA097744
Original AD Number: ADA097744

An analysis of an inelastic ACLS plunge mode dynamic model ACLS is presented. The ACLS has unrestrained side elements and frozen end elements. The model exhibits unstable behavior at certain operating conditions for which the side elements are in contact with the ground. A linear analysis showed this instability to be due mainly to the altitude sensitivities of the cushion to atmosphere airflows and the attendant influence on the dynamic pressure forces on the vehicle. the model instability can be alleviated by isolating side and end elements so that they are all unrestrained and by simultaneously venting the air cushion directly to atmosphere.

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