Question

The thrust of a helicopter propeller shaft is absorbed by 6 bearing collars. The rubbing surfaces of these collars have outer diameter 300 mm and inner diameter 200 mm. If the shaft runs at 120 rpm., the bearing pressure amounts to 0.4 N/mm2. The coefficient of friction may be taken as 0.05. Assuming that the pressure is uniformly distributed, determine the power absorbed by the collars.

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