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  2. Capacitor discharge ignition - Wikipedia

    en.wikipedia.org/wiki/Capacitor_discharge_ignition

    Capacitor discharge ignition (CDI) or thyristor ignition is a type of automotive electronic ignition system which is widely used in outboard motors, motorcycles, lawn mowers, chainsaws, small engines, gas turbine-powered aircraft, and some cars.

  3. Power-to-weight ratio - Wikipedia

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

    The useful power of an engine with shaft power output can be calculated using a dynamometer to measure torque and rotational speed, with maximum power reached when torque multiplied by rotational speed is a maximum. For jet engines the useful power is equal to the flight speed of the aircraft multiplied by the force, known as net thrust ...

  4. Outboard motor - Wikipedia

    en.wikipedia.org/wiki/Outboard_motor

    The Waterman outboard engine appears to be the first gasoline-powered outboard offered for sale in significant numbers. [11] It was developed from 1903 in Grosse Ile, Michigan, with a patent application filed in 1905 [ 12 ] Starting in 1906, [ 13 ] [ 14 ] the company went on to make thousands of his "Porto-Motor" [ 15 ] units, [ 16 ] claiming ...

  5. MAP sensor - Wikipedia

    en.wikipedia.org/wiki/MAP_sensor

    This is called the speed-density method. Engine speed (RPM) is also used to determine where on a look up table to determine fuelling, hence speed-density (engine speed / air density). The MAP sensor can also be used in OBD II (on-board diagnostics) applications to test the EGR (exhaust gas recirculation) valve for functionality, an application ...

  6. Ignition timing - Wikipedia

    en.wikipedia.org/wiki/Ignition_timing

    Pressure in cylinder pattern in dependence on ignition timing: (a) - misfire, (b) too soon, (c) optimal, (d) too late. In a spark ignition internal combustion engine, ignition timing is the timing, relative to the current piston position and crankshaft angle, of the release of a spark in the combustion chamber near the end of the compression stroke.

  7. Hydroplane (boat) - Wikipedia

    en.wikipedia.org/wiki/Hydroplane_(boat)

    That day the No-Vac set the world water speed record for an outboard powered boat of 78 miles per hour (126 km/h). The basic hull design of most hydroplanes has remained relatively unchanged since the 1950s: two sponsons in front, one on each side of the bow; behind the wide bow , is a narrower, mostly rectangular section housing the driver ...

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  9. Sterndrive - Wikipedia

    en.wikipedia.org/wiki/Sterndrive

    A sterndrive or inboard/outboard drive (I/O) is a form of marine propulsion which combines inboard power with outboard drive. The engine sits just forward of the transom while the drive unit ( outdrive or drive leg ) lies outside the hull .