hp (1119 kW) Honeywell AGT1500 (originally made by Lycoming ) gas turbine , and a six speed (four forward, two reverse) Allison X-1100-3B Hydro-Kinetic Automatic transmission , giving it a governed top speed of 45 mph (72 km/h ) on paved roads, and 30 mph (48 km/h) cross-country. With the engine