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  2. Engine balance - Wikipedia

    en.wikipedia.org/wiki/Engine_balance

    Excessive hammer blow from high slipping speeds was a cause of kinked rails with new North American 4–6–4s and 4–8–4s that followed the 1934 A.A.R. recommendation to balance 40% of the reciprocating weight. [8] Out-of-balance inertia forces in the wheel can cause different vertical oscillations depending on the track stiffness.

  3. Balancing of rotating masses - Wikipedia

    en.wikipedia.org/wiki/Balancing_of_rotating_masses

    These four readings are sufficient to define the size and position of a final mass to achieve good balance. Ref 4 For production balancing, the phase of dynamic vibration is observed with its amplitude. This allows one-shot dynamic balance to be achieved with a single spin, by adding a mass of internally calculated size in a calculated position.

  4. Flat engine - Wikipedia

    en.wikipedia.org/wiki/Flat_engine

    In 1902, the Pearse monoplane (which would later become one of the first aircraft to achieve flight) was powered by a flat-twin engine. Amongst the first commercially-produced aircraft to use a flat engine was the 1909 Santos-Dumont Demoiselle range of aeroplanes, which was powered by boxer-twin engines. [citation needed]

  5. Compressor map - Wikipedia

    en.wikipedia.org/wiki/Compressor_map

    A compressor map is a chart which shows the performance of a turbomachinery compressor. This type of compressor is used in gas turbine engines, for supercharging reciprocating engines and for industrial processes, where it is known as a dynamic compressor. A map is created from compressor rig test results or predicted by a special computer program.

  6. Harmonic damper - Wikipedia

    en.wikipedia.org/wiki/Harmonic_damper

    A harmonic balancer (sometimes called crankshaft damper, torsional damper, or vibration damper) is the same thing as a harmonic damper except that the balancer includes a counterweight to externally balance the rotating assembly. The harmonic balancer often serves as a pulley for the accessory drive belts turning the alternator, water pump and ...

  7. 6 Balance Exercises for Seniors That Will Keep You Loose and ...

    www.aol.com/6-balance-exercises-seniors-keep...

    “The main reason many people have balance problems when they get older is because our senses tend to decline as we age,” explains Sabrena Jo, a personal trainer certified in working with ...

  8. Why do airlines need to weigh passengers? - AOL

    www.aol.com/news/why-airlines-weigh-passengers...

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  9. Variable-pitch propeller (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Variable-pitch_propeller...

    When an aircraft is stationary with the propeller spinning (in calm air), the relative wind vector for each propeller blade is from the side. However, as the aircraft starts to move forward, the relative wind vector comes increasingly from the front. The propeller blade pitch must be increased to maintain optimum angle of attack to the relative ...

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