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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

    If the reference speed of rotation is 2400 RPM then the timer runs in real time when the engine is running at 2400 RPM, half speed while the engine is run at 1200 RPM (a fast idle for some aviation engines) or at 5/6ths real time at 2000 RPM (a slow cruise speed). [1] The tach timer integrates over time the instantaneous rotation speed ...

  4. 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 ...

  5. Revolutions per minute - Wikipedia

    en.wikipedia.org/wiki/Revolutions_per_minute

    Modern automobile engines are typically operated around 2000 rpm – 3000 rpm (33 Hz – 50 Hz) when cruising, with a minimum (idle) speed around 750 rpm – 900 rpm (12.5 Hz – 15 Hz), and an upper limit anywhere from 4500 rpm to up to 10 000 rpm (75 Hz – 166 Hz) for a road car, very rarely reaching up to 12 000 rpm for certain cars (such ...

  6. Redline - Wikipedia

    en.wikipedia.org/wiki/Redline

    Tachometer showing red lines above 14,000 rpm.. The redline is the maximum engine speed at which an internal combustion engine or traction motor and its components are designed to operate without causing damage to the components themselves or other parts of the engine. [1]

  7. TI SR-50 - Wikipedia

    en.wikipedia.org/wiki/TI_SR-50

    The SR-50 measured 5-3/4 inches long by 3-1/8 inches wide by 1-3/16 inches high (147 mm by 78 mm by 31 mm) and was powered by a rechargeable NiCad battery pack, built from three welded AA cells. It had 40 keys, and flat sliding switches for degrees / radians and on/off.