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A Hartnell governor having a central sleeve spring and two right angled bell crank levels moves between 290r.p.m. and 310rpm for a sleeve lift of 15mm.
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The sleeve arms and the ball arms are 80 mm and 120 mm respectively. The levers are pivoted @ 120 mm from the governor axis and mass of each ball is 2.5 kg. The law arms are parallel to the governor axis @ lowest equilibrium speed. …

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