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  2. Tachometer - Wikipedia

    en.wikipedia.org/wiki/Tachometer

    A tachometer that can indicate up to 7000 RPM (left) A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are ...

  3. Tach timer - Wikipedia

    en.wikipedia.org/wiki/Tach_Timer

    The tach timer is usually used to schedule engine maintenance, although it is just an approximation of "Time in service" which is used to time and schedule aircraft maintenance. Time in service is defined in 14 CFR 1.1 [ 2 ] as the actual time in the air, whereas tach time measures engine revolutions, which would still count time on the ground ...

  4. Rally-Pac - Wikipedia

    en.wikipedia.org/wiki/Rally-Pac

    Rally-Pac is the name given to an optional tachometer and clock fitted to certain car models built by the Ford Motor Company in the mid-1960s. The steering column-mounted accessory was introduced in 1963 soon after Ford's successful participation in that year's Monte Carlo Rally , hence the name.

  5. Hobbs meter - Wikipedia

    en.wikipedia.org/wiki/Hobbs_meter

    At these times, the clock runs slower. Depending on the type of flight, tach time can be 10–20% less than Hobbs time. Many organizations, such as flying clubs, charge by tach time so as to differentiate themselves from fixed-base operators as 10–20% less time recorded makes it 10–20% cheaper to fly (if the hourly rate is the same). In the ...

  6. Dynamometer - Wikipedia

    en.wikipedia.org/wiki/Dynamometer

    Reaction is smooth down to zero RPM without stick-slip. Loads up to hundreds of thermal horsepower can be absorbed through the required force lubrication and cooling unit. Most often, the brake is kinetically grounded through a torque arm anchored by a strain gauge which produces a current under load fed to the dynamometer control.

  7. Rev limiter - Wikipedia

    en.wikipedia.org/wiki/Rev_limiter

    As the RPM of the engine increases, the throttle plate in the carburetor is gradually closed, reducing the amount of fuel and air admitted to the engine, until the engine RPM is stable. If RPM drops below the desired value, the throttle plate will automatically open, admitting more fuel/air mix to the engine.

  8. Air core gauge - Wikipedia

    en.wikipedia.org/wiki/Air_core_gauge

    An auto tachometer has a sweep of about 240-250 degrees and typically uses an air core gauge. An air core gauge is a specific type of rotary actuator in an analog display gauge that allows an indicator to rotate a full 360 degrees. It is used in gauges and displays, most commonly automotive instrument clusters.

  9. Revolutions per minute - Wikipedia

    en.wikipedia.org/wiki/Revolutions_per_minute

    Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min −1) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to ⁠ 1 / 60 ⁠ hertz .

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