The engine was a 270 hp ( 200 kW ) V - 12 Rolls Royce Falcon III , a water - cooled unit that ran upright .
The propeller shaft was at the bottom of the fuselage .
The engine was a 270 hp ( 200 kW ) V - 12 Rolls Royce Falcon III , a water - cooled unit that ran upright so that the propeller shaft was at the bottom of the fuselage .