1. The problem statement, all variables and given/known data Given a 1.5” output shaft, a 80-90 ksi yield strength. Neglecting limitations of keys or gear reducer what is the maximum HP that could be transmitted by the 1.5” shaft 2. Relevant equations Torque = (63025*H)/n H is HorsePower and n is RPM Force = Torque/radius 3. The attempt at a solution If I can find the maximum force then the maximum torque/HP can be calculated using the above equations. I m not sure how to calc the max shear force using the given data.