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Forward Drive
A "forward drive" is a form of marine propulsion that leverages forward-facing counter-rotating props to pull the boat through water rather than pushing it, with an undisturbed water flow to the propellers. The engine sits just forward of the transom while the drive unit (outdrive or drive leg) lies outside the hull.
==Operation==
The drive unit transmits power from the inboard engine, generally mounted above the waterline, outboard through the transom and downward to the propellers below the waterline.〔(【引用サイトリンク】title=Forward Drive propulsion system )〕 The propellers lie about 27 inches further forward than the props of a Duoprop and move from an exposed position beyond the transom to underneath the hull, away from a surfer’s exposed appendages.〔(【引用サイトリンク】title=Volvo Penta Forward Drive: Designed for Wake Surfing, Introduced at Miami )〕 This causes the thrust to be multi-directional rather than bi-directional.〔(【引用サイトリンク】title=Four Winns TS222 and Volvo-Penta Forward Drive )〕 The exhaust exits under the water, keeping it away from the rider’s face.〔(【引用サイトリンク】title=Boat Trader )〕 The engine can be trimmed up and down which equates to less wetted area.〔(【引用サイトリンク】title=WAKESURFING WITH VOLVO PENTA'S FORWARD DRIVE )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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