1. The problem statement, all variables and given/known data A solid drive shaft is connected to an engine by a coupling, which has drive pins located on a pitch circle diameter of 80 mm (Note: the diameter of the pitch circle is greater than the diameter of the drive shaft). If the maximum power output of the engine is 90kW at 5000 rev/min, the shear stress in drive pins is not to exceed 60 MN/m2, and the shear stress in drive shaft is not to exceed 70 MN/m2, determine: (i) The minimum acceptable diameter of the shaft (ii) If the minimum number of solid drive pins that are required is 5 determine the diameter of each pin 2. Relevant equations T/J=[itex]\tau[/itex]/r P=Tω 3. The attempt at a solution I worked out the torque of the engine to be 47.12 MNm by using P=Tω but can I just put this value into T/J=[itex]\tau[/itex]/r to find the answer to (i)?