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A trolling motor is a self-contained marine propulsion unit that includes an electric motor, propeller and control system, and is affixed to an angler's boat, either at the bow or stern. A gasoline-powered outboard used in trolling , if it is not the vessel's primary source of propulsion, may also be referred to as a trolling motor.
The Forty Minus and Plus used identical power units, but the Plus had a larger gearbox and propeller. The Century and Century Plus used even larger gearboxes and propellers. The Century models were available either as short-shaft or long shaft. The Silver Century Plus model could propel a displacement hull of up to 26 feet in length. [6]
To establish the "largest" category, several factors take precedence: overall weight, which gives traction over driving axles; size (length and height of engine itself); and power, which may be in terms of raw horsepower, tractive effort, available power at axles (shaft horsepower) or, in the case of steam locomotives, available steam on a ...
The fuel tank has a capacity of 3.5 gallons. The engine was electrically started from a 12-volt battery system. A pull type starter cord was also available. The propeller shaft and underwater exhaust extended one foot below the keel. Aqua Dart was in negotiations with Mercury Marine for additional engines to support its needs in 1966.
Its largest 14-cylinder version is 13.5 meters high, 26.59 meters long, weighs over 2,300 tonnes, and produces 80.08 megawatts. The engine is the largest reciprocating engine in the world. The 14-cylinder version first entered commercial service in September 2006 aboard the Emma Mærsk .
Outboard motor shaft lengths are standardized to fit 15-, 20- and 25-inch (38-, 51- and 64-centimeter) transoms. If the shaft is too long it will extend farther into the water than necessary creating drag, which will impair performance and fuel economy. If the shaft is too short, the motor will be prone to ventilation.