I have : Cylinder : 958,000 lbs Motor 200 HP required RPM : 5 time : 60 seconds Torque: 18,757 lbs-ft What to find ? Time required by the motor to reach that torque Doubt : Is there a chart or a graph that gives this value ? is there any eqaution / formula that helps finding this time ? or is 60 seconds the answer ? Also, 18,757 is the torque and a 18HP is what is required to reach 5 rpm in 60 seconds. How do you calculate the torque required to keep it running. Isn't, 18,757 the just the start-up torque ? Assuming no friction or energy losses, how to calculate this running torque?