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Old 3rd Apr 2022, 04:29
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The R-22 and 44 have what is called a teetering rotor head, any aircraft with such a design is subject to mast bumping, which if severe enough will cause the rotor to separate. The issue first came to prominence with the Huey series of helicopters where the US Army lost a number and so embarked on an education program. My unit lost one with its four crew and ten soldiers in Vietnam, the usual precipitating cause was a zoom climb followed by reduced "g" on the push over at the top of climb, but that's not the only manner in which to induce the problem. The following twenty minute US Army training video should enlighten as to the ins and outs of the phenomena.

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