Surface Effect Ships (SES) can operate hullborne like displacement ships or they can operate in a cushionborne mode by pressurizing the region between that catamaran hulls with air. The air cushion exerts both a lift and a drag force on the hull as it moves over the water surface. The drag force, known as cushion wave making drag, represents a significant percentage of total SES resistance and hence, the required propeller thrust. Selection of cushion length-to-beam proportions is a fundamental part of SES design because the ratio of these dimensions determines the wave making resistance characteristics. The Navy has been conducting research on the effect of length-to-beam proportions on SES performance, seakeeping and maneuvering. This balanced performance is attributable to shifting the peak of the high wave drag region known as 'hump' outside the operating envelope. The name 'High Length-to-Beam SES' has been given to these vessels to distinguish them from the previous generation of Navy SES which had lower length-to-beam ratios and had to be propelled through a high drag speed regime in order to retain efficient cruise speeds.
SES-200 (Surface Effect Ship) Technical Evaluation Test Report
1984
201 pages
Report
Keine Angabe
Englisch
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