The engine of a helicopter is delivering 600 hp to the rotor shaft AB when the blade

Question:

The engine of a helicopter is delivering 600 hp to the rotor shaft AB when the blade is rotating at 1200 rev/min. Determine to the nearest in. the diameter of the shaft AB if the allowable shear stress is τ_allow = 8 ksi and the angle of twist of the shaft is limited to 0.05 rad. The shaft is 2 ft long and made from L2 steel.

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