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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.
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]
[when?] [5] The "Verado" system integrates the outboard into an entire system, including "fly-by-wire" steering and advanced diagnostics. Verado engines are available in 250 hp and 300 hp (V8), 350 hp and 400 hp (V10, introduced in 2022), and 600 hp (V12) as of early 2021. In 2007 Mercury Marine began selling its Zeus drive system. [6]
1927 Johnson Seahorse outboard motor at the Tellus Science Museum. The original company that made Johnson inboard motors and outboard motors was the Johnson Brothers Motor Company of Terre Haute, Indiana, United States. They started building inboard 2-cycle marine engines in 1903 in a barn behind the house, along with matching boats.
15.5 hp @ 9000 rpm ... Perfect primary balance, no balance shaft; ... The water-cooled outboard motor is designed for 25-feet+ boats. It has a displacement of 4952 cc ...
Outboard Marine Corporation sometimes referred to as Outboard Motor Company was formed in 1929 when ELTO was merged with Lockwood-Ash Motor Company. They began using the name OMC in 1956. Outboard Marine Corporation was the world's largest manufacturer and supplier of outboard motors and second largest producer of powerboats.