| 摘要 |
A propulsion system component or accessory specifically used for boats which utilize either an inboard-outboard motor, or an outboard motor. A cylindrical shroud very closely surrounds the peripheral sides of a propeller situated inside, while leaving exposed the front and rear surface areas of the propeller. The shroud closely surrounds the peripheral circumference of the propeller blades by 360 degrees. This unique aspect of the shroud minimizes slippage and maximizes fluid displacement. The shroud is installed symmetrically as to ensure uniform distance between the shroud and all propeller blades. The front of the shroud is considered the leading edge, and the rear of the shroud is considered the trailing edge. The leading edge of the shroud allows unrestricted laminar flow to the propeller from the front. The trailing edge of the shroud directs propeller wash from the rear of the propeller, out through the trailing edge of the shroud. The trailing edge of the shroud is unique in that it extends behind a propeller's trailing edge by at least 12 inches, enough to restrict accidental access of the average adult size foot even if placed directly inside the shroud. The shroud is provided with apparatus for mounting on the lower portion of the motor itself, or could be factory casted directly by the motor boat engine manufacturer. Installation of the system requires little modification to the motor itself. This system requires no modification to the boat, transom, or propeller. The system will minimize slippage, while maximizing fluid displacement, expulsion zone exit flow rates, and individual safety.
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