THE DEVELOPMENT OF A NON-DIMENSIONAL LIFT AIR COEFFICIENT FOR AIR CUSHION VEHICLES
The development of a non-dimensional performance parameter, describing the lift air flow required for an air cushion vehicle, was the purpose of this project. The Lift Air Coefficient had to be easily modified to account for planform geometry, the arrangement of plenum and vegetation encountered. The results of a theoretical analysis of planform effects were checked experimentally, while vegetation and clustering effects were related to Lift Air Coefficient by an empirical relation developed after tests were run. Vehicle shape was found to have the most important planform effect, while clustering changed the coefficient by very little. The shape factor used was a ratio of the square root of the planform area to the total perimeter. Vegetation of uniform density was accounted for by a modification of the coefficient by a ratio of vegetation height to the height above ground of the same material under a heavy weight. Due to a leakage problem, the accuracy of the Lift Air Coefficient values was poor in the lowest hoverheight region. (Author)
National Research Council of CanadaAssociate Committee on Air Cushion Technology, Montreal Road
Ottawa, ONo K1A OR6, Canada
- Publication Date: 1975-2
- Pagination: 21 p.
- TRT Terms: Air cushion vehicles
- Old TRIS Terms: Air cushion technology; Air cushion vehicle performance
- Subject Areas: Marine Transportation; Vehicles and Equipment;
- Accession Number: 00183732
- Record Type: Publication
- Source Agency: Arctic Science and Technology Information System
- Report/Paper Numbers: Tech Rpt.
- Files: TRIS
- Created Date: Dec 12 1978 12:00AM