The motor delivers 50 hp while turning at a constant rate of 1350 rpm at A. Using the belt and pulley system this loading is delivered to the steel blower shaft BC. Determine to the nearest 1/8 in. the smallest diameter of this shaft if the allowable shear stress for steel is τ allow = 12 ksi.

Prob [5-30]: The motor delivers 50 hp while turning at a constant rate of 1350 rpm at A. Using the belt and pulley system this loading is delivered to the steel blower shaft BC. Determine to the nearest 1/8 in. the smallest diameter of this shaft if the allowable shear stress for steel is τ allow = 12 ksi.