5_11 - Problem 5.11 Air cushion vehicle The sketch (a)...

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Problem 5.11 Air cushion vehicle The sketch (a) shows the cross-section of an air cushion vehicle of the "peripheral jet" type, first developed by Christopher Cockerell in the mid-1950s. A fan draws air from the ambient atmosphere at pressure p a and compresses it to a stagnation pressure p o in the reservoir inside the vehicle. The air then exhausts downward through a narrow slot of width w at the periphery of the vehicle (w<<R) , creating a condition that maintains a positive gage pressure (an "air cushion") underneath the vehicle. This allows the vehicle to float at a height h above the ground. This problem is concerned with the mechanics of how the “air cushion” is maintained the vehicle holds itself off the ground. In what follows we assume that the vehicle has total mass M and is circular with outer radius R ,, the slot has a width w that is very small compared with R , the jet issues vertically downward from the slot as shown, and the vehicle’s elevation h is always small compared with R . A fan or turbine
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This note was uploaded on 02/27/2012 for the course MECHANICAL 2.25 taught by Professor Garethmckinley during the Fall '05 term at MIT.

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5_11 - Problem 5.11 Air cushion vehicle The sketch (a)...

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