A study was conducted to determine whether a general aviation airplane powered by one turboprop engine could be configured to have a speed, range, and payload comparable to current twin-engine turboprop aircraft and also achieve o'" a significant increase in fuel efficiency. An airplane configuration was developed which can carry six people for a no-reserve range of 2 408 km (l 300 n.mi.) at a cruise speed above 154 m/s (300 kt) and a cruise altitude above 9 144 m (30 000 ft). This cruise speed is comparable to that of the fastest of the current twin turboprop-powered airplanes.