The tubular drive shaft for the propeller of a hovercraft

Chapter 5, Problem 5-71

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The tubular drive shaft for the propeller of a hovercraft is 6 m long. If the motor delivers 4 MW of power to the shaft when the propellers rotate at 25 rad/s, determine the required inner diameter of the shaft if the outer diameter is 250 mm. What is the angle of twist of the shaft when it is operating? Take \(\tau_{\text {allow }}=90 \mathrm{MPa}\) and G = 75 GPa.

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