. The gearbox system of a small aircraft has four gears and these are attached to a circular shaft to transmit the torques as shown in figure 5(b). The allowable shear stress in the shaft is 10,000 psi. i) What is the required diameter d of the shaft if it has a solid cross section? ii) What is the required outside diameter do if the shaft is hollow with an inside diameter, di = 1 in.
