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Q4. A hollow propeller shaft of 380 mm outside diameter and 320 mm inside diameter runs at 90 rev/min and propels a ship through the water at 17 knots. The total resistance of the ship through the water at this speed is 300 kN and the propeller efficiency is 78%. Calculate EACH of the following:

(a) the power transmitted by the shaft;

(b) the angel of twist of the shaft per metre length in degrees;

(c) the maximum torsional stress in the shaft.

Note: Modulus of Rigidity of Shaft Material 80 GN/m².

1 knot = 0.514 m/s