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  2. Outboard motor - Wikipedia

    en.wikipedia.org/wiki/Outboard_motor

    In 1984, Yamaha introduced their first four-stroke outboards, which were only available in the low-power range. In 1990 Honda released 35 hp and 45 hp four-stroke models. They continued to lead in the development of four-stroke engines throughout the 1990s as US and European exhaust emissions regulations such as CARB ( California Air Resources ...

  3. Yamaha OX66 engine - Wikipedia

    en.wikipedia.org/wiki/Yamaha_OX66_engine

    Yamaha started development of the OX66 in 1984 [1] as a design concept for a lightweight and compact Formula Two engine with a wide power band.. At the time of development, both BMW and Honda provided engines for F2 (in the form of the M12/7 inline-four and the RA260E V6 respectively), but Honda's engine yielded superior results despite limited use.

  4. Two-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_power_valve_system

    A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...

  5. Yamaha SuperJet - Wikipedia

    en.wikipedia.org/wiki/Yamaha_SuperJet

    The Yamaha FX-1 is the only other stand-up personal watercraft produced by Yamaha, and was produced in limited numbers from 1994-1995. On August 12, 2020 Yamaha released the new 2021 SuperJet. This is the first complete redesign from the ground up since the introduction in 1990, and marks 30 years of SuperJet history.

  6. Power-to-weight ratio - Wikipedia

    en.wikipedia.org/wiki/Power-to-weight_ratio

    A typical turbocharged V8 diesel engine might have an engine power of 250 kW (340 hp) and a mass of 380 kg (840 lb), [1] giving it a power-to-weight ratio of 0.65 kW/kg (0.40 hp/lb). Examples of high power-to-weight ratios can often be found in turbines.

  7. Advance ratio - Wikipedia

    en.wikipedia.org/wiki/Advance_ratio

    Diameter of the propeller. The propeller advance ratio or coefficient is a dimensionless number used in aeronautics and marine hydrodynamics to describe the relationship between the speed at which a vehicle (like an airplane or a boat) is moving forward and the speed at which its propeller is turning.