Based on the Beechcraft Twin Bonanza, the multi engine piston Beechcraft Queen Air series set the basis for the Beechcraft King Air series. The Queen Airs are twin engine craft using the Lycoming IGSO-540 A1D supercharged 380 hp. The cruising speed is 159 kts (183 mph, 294 km/h) and the maximum speed is 215 kts (248 mph, 400 km/h). The Queen Air holds nine passengers with one to two crew members. The empty weight for the aircraft is 5,227 lbs (2,393 kg) and the maximum takeoff weight is 8,800 lbs (3,992 kg).