| | R66 Turbine | R66 Marine |
| Engine | Rolls Royce RR300 Turbine | Rolls Royce RR300 Turbine | |
| Horsepower | 300 shp turboshaft; derated to 270 shp for takeoff and 224 shp continuous | 300 shp turboshaft; derated to 270 shp for takeoff and 224 shp continuous | |
| Maximum Gross Weight | 2700 lb (1225 kg) | 2700 lb (1225 kg) | |
| Approximate Empty Weight (including oil & standard avionics) | 1290 lb (585 kg) | 1355 lb (615 kg) | |
| Fuel Capacity (73.6 gal) | 493 lb (224 kg) | 493 lb (224 kg) | |
| Pilot, Passengers, and Baggage (with maximum fuel) | 917 lb (416 kg) | 852 lb (386 kg) | |
| Cruise Speed at Maximum Gross Weight | up to 110 kts (204 km/h) | up to 110 kts (204 km/h) | |
| Maximum Range (no reserve) | approximately 350 nm (650 km) | approximately 350 nm (650 km) | |
| Hover Ceiling IGE at Maximum Gross Weight | over 10,000 ft | over 10,000 ft | |
| Hover Ceiling OGE at Maximum Gross Weight | over 10,000 ft | over 10,000 ft | |
| Rate of Climb | over 1000 fpm | over 1000 fpm | |
| Maximum Operating Altitude | 14,000 ft | 14,000 ft | |
| Electrical System | 28 volt | 28 volt | |
