| 摘要 |
Amphibious vehicle ( 50 ), with reference to FIG. 4, has jet drive ( 30 ) packaged behind power train ( 20, 22 ), but also configured to produce sufficient thrust for planing, despite drag created by open arches around retractable wheels ( 52 ). The ratio of thrust to jet intake length is at least 18 kN/m. The ratio of fluid inlet area to fluid outlet area may be between (2.5) and (3.5). The rate of fluid flow through the jet may be 0 to 1.5 m<SUP>3</SUP>/sec. The maximum thrust may be 7700N, from an engine peak power of less than 135 kW, with a jet less than 860 mm long. The jet drive shaft may be skewed laterally; and may be cantilevered from a bearing in the conduit wall; which bearing may be rotated when the vehicle is driven on roads. Water flow through the jet may be reversible; alternatively, a reversing bucket may be fitted.
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