| 摘要 |
A housing for the prop of a conventional gasoline or diesel powered marine engine is provided attachable to a bracket mount on the engine. The housing completely encloses the engine's prop and drive shaft and defines a tubular flow path for the water engaged by the prop with the flow path being generally coaxial with respect to the prop's rotation axis. The housing has an anterior inlet port of cross-sectional area A1 and a posterior outlet port of cross-sectional area A2 wherein A1>A2. A smooth transition of the different cross-sectional areas of the tubular housing is effected by an intermediate tapered section. Drive shaft extension means are provided so that the prop rotates in the region of the housing's least cross-sectional area.
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