Maybe this is relevant.
Rotorway Exec
Data from Brassey's World Aircraft & Systems Directory 1999/2000 [7]
General characteristics
Crew: 2
Length: 22 ft (6.71 m)
Rotor diameter: 25 ft (7.62 m)
Height: 8 ft (2.44 m)
Disc area: 380 sq ft (35.4 m²)
Empty weight: 975 lb (442 kg)
Useful load: 525 lb (238 kg)
Max. takeoff weight: 1,500 lb (680 kg)
Powerplant: 1 × RotorWay RI 162F flat-four piston engine, 150 hp (112 kW)
Performance
Maximum speed: 115 mph (100 knots, 185 km/h) at sea level
Cruise speed: 95 mph (82 knots, 153 km/h)
Range: 180 mi (156 nmi, 290 km)
Endurance: 2 hr with maximum fuel
Service ceiling: 5,000 ft (1,525 m) hover ceiling, out of ground effect
Rate of climb: 1,000 ft/min (5.1 m/s)
Kip