The Bell 412 is a utility helicopter manufactured by Bell Helicopter. It is a development of the Bell 212 model, the major difference being the composite four-blade main rotor.
Design and development
Development began in the late 1970s with two Bell 212 being converted into 412 prototypes. An advanced four blade main rotor with a smaller diameter replaced the 212's two blade rotor. A Bell 412 prototype first flew in August 1979. The initial model was certified in January 1981 with the deliveries commencing in the same month.
The 412 model was followed by the 412SP (Special Performance) version featuring larger fuel capacity, higher takeoff weight and optional seating arrangements. In 1991, the 412HP (High Performance) variant with improved transmission replaced the SP version in production. The current production version, 412EP (Enhanced Performance), is equipped with a dual digital automatic flight control system.
Over 700 Model 412s (including 260 by AgustaWestland) have been built.
Crew: 1-2 pilots
Capacity: up to 13 passengers, maximum external load of 4,500 lb (2,040 kg)
Length: 56 ft 1 in (17.1 m)
Rotor diameter: 46 ft (14.0 m)
Height: 15 ft (4.6 m)
Disc area: 1,662 ft² (154.4 m²)
Empty weight: 6,789 lb (3,079 kg)
Max. takeoff weight: 11,900 lb (5,397 kg)
Powerplant: 2 × Pratt & Whitney Canada PT6T-3BE Twin-Pac turboshafts, 900 shp (671 kW) each
Fuselage length: 43 ft (13.1 m)
Maximum speed: 140 knots (161 mph, 259 km/h)
Cruise speed: 122 knots (140 mph, 226 km/h)
Range: 402 nmi (463 mi, 745 km)
Service ceiling: 20,000 ft (6,096 m)
Rate of climb: 1,350 ft/min (6.86 m/s)
Power/mass: 0.2663 hp/lb (437 W/kg)