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  2. Prony brake - Wikipedia

    en.wikipedia.org/wiki/Prony_brake

    The difference between the two readings multiplied by the radius of the driven drum is equal to the torque. If the engine speed is measured with a tachometer, the brake horsepower is easily calculated. An alternate mechanism is to clamp a lever to the shaft and measure using a single balance.

  3. Timing light - Wikipedia

    en.wikipedia.org/wiki/Timing_light

    Timing light, combination instrument with RPM, volt meter and dwell angle meter. The actual light is on the far end. The black clamp connects to the battery -, the red clamp to +, the green one to the breaker side of the coil (for RPM), the big black clamp in the foreground is an inductive pick-up that clamps around a spark plug wire.

  4. 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 ...

  5. Rev limiter - Wikipedia

    en.wikipedia.org/wiki/Rev_limiter

    Using the clutch as quickly as possible may avoid engine damage. [1] Most small engines, such as on lawn mowers have a speed governor. 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.

  6. 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 by the fact that 10-20% less time recorded makes it 10-20% cheaper to fly (if the hourly rate is the same).

  7. Apparent carbon monoxide poisoning leaves 12 people dead at ...

    www.aol.com/news/apparent-carbon-monoxide...

    Georgian officials believe that 12 people died at a ski resort due to an apparent carbon monoxide poisoning, according to reports by the BBC, Sky News, and other news outlets.. Mtskheta-Mtianeti ...

  8. The Secret Bedtime Hack I Followed to Fall Asleep an Hour Earlier

    www.aol.com/secret-bedtime-hack-followed-fall...

    I was never good at falling asleep before midnight, but after following this easy bedtime hack, I was getting to bed an hour earlier.

  9. 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 ...