Question

sel engine for a commercial boat operates at 200 rpm and delivers 800 hp through a 1) A die with a ratio of 4 to 1 to the propeller as shown below. Because the propeller shaft gearbox ed is four times that of the crank shaft, the torque on the propeller shaft is one-fourth that spe o the crank shaft. Both the shaft from the engine to the gearbox and the propeller shaft are to be solid and made of heat-treated alloy steel. Determine the minimum permissible diameters two shafts if the allowable shearing stress is 20 ksi and the angle of twist in a 10-ft for the length of the propeller sh that the propeller shaft is subjected to pure torsion. aft is not to exceed 4°. Neglect power loss in the gearbox and assume Motor Gear Propeller Tp

Answer 1