These give ships better maneuverability than a fixed propeller and rudder system. Compare to propeller and jet aircraft engines. This powered a four-bladed wooden pusher propeller. Thus was born the idea to mate a turbine engine to a traditional propeller. The batteries directly power the electric motor that drives the single screw propeller. I aircraft to fire through the spinning propeller. The steam drove four geared turbines, one for each propeller shaft. The inboard propeller windmilled to a stop. Forces acting on the blades of an aircraft propeller include the following. Hartzell aluminium propeller via a reduction gearbox. The ship was only capable of a speed of from her two operating propeller shafts. There were no problems with propeller shaft failure. Robin tells him the hull near the propeller shaft is only thick. Each ship had four shafts, each with a propeller. Neutral was provided for disengagement of both propeller shafts.