A Control for Large Prime Movers Driving Controllable Pitch Propellers

The Nordberg control which programs the power output of a prime mover regardless of external conditions, such as flow of water to the propeller, ship's draft, or number of prime movers geared to shafting is described. The control establishes the quantity of fuel to be used by the prime mover at any set speed, thereby fixing its torque output, and varies the propeller pitch to suit the set speed and programmed torque. It accomplishes this by integrating the action of two governors, one controlling fuel and the other propeller pitch.