The outdrive can be matched with a variety of engines in the appropriate power range upper and lower units can often be purchased separately to customize gear ratios and propeller RPM, and lower units are also available with counter-rotating gearing to provide balanced torque in dual-drive installations. The outdrive is pivoted up for trailer travel and between uses to avoid fouling. The boat is steered by pivoting the outdrive, as on an outboard motor no rudder is needed. The outdrive resembles the bottom half of an outboard motor and is composed of two sub-units: an upper containing a driveshaft connected through the transom to an engine which transmits power to a 90-degree-angle gearbox and the lower containing a vertical driveshaft receiving power from the upper unit gearbox, transmitted through another 90-degree-angle gearbox to the propeller shaft. The drive unit (outdrive) carries power from the inboard engine, typically mounted above the waterline, outboard through the transom and downward to the propeller below the waterline. The engine sits just forward of the transom while the drive unit ( outdrive or drive leg) lies outside the hull. The outdrive unit of a boat with sterndriveĪ sterndrive or inboard/outboard drive ( I/O) is a form of marine propulsion which combines inboard power with outboard drive. JSTOR ( September 2014) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.
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