| 摘要 |
A boat has one or more jet pumps (30,32) with appropriate water intakes and jet nozzles (32) to drive the boat and one or more outboard motors (34) to drive the boat. The boat may also have one or more hydroplane fins (38) allowing the hull of the boat to be lifted out of the water for fast hydroplaning motion. The hydroplane fins (38) are extendable and retractable and the one or more jet pumps (30,32) and/or outboard motors (34) are movably mounted and can be lowered so as to be disposed below the water level in efficient operating position even when the hydroplane fins (38) are extended and the hull of the boat is lifted out of the water for fast hydroplaning motion. <IMAGE>
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