| 摘要 |
A ducted propulsion system for waterborne, semi-submerged or fully submerged vessels comprising a ducted system having two or more intake ducts which open below the mid depth of the vessel, and which merge into a specially shaped non-circular composite duct which generally extends in the fore and aft direction of the vessel. Propeller means are mounted independently in the composite duct and adapted to induce a flow of water through the system of ducts to propel said vessel. The propeller means comprise two or more propellers or impellers each having its own independent shafting, bearings and supporting structure.
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