The Bell 412 is a twin-engine utility helicopter of the Huey family manufactured by Bell Helicopter.
Bell 412SP Four Twelve
Design and development
Development began in the late 1970s with two Bell 212s 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 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. In 2013 Bell introduced the 412EPI which includes an electronic engine control (FADEC) for a PT6T-9 engine upgrade, and a glass cockpit display system similar to the Bell model 429. Also featured is a Garmin touchscreen navigation system, and the BLR Strake and Fast Fin upgrades for improved hover performance.
Over 700 Model 412s (including 260 by AgustaWestland) have been built
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Bell Griffin HT1
Advanced training helicopter based on the Bell 412EP, operated by the Royal Air Force (RAF) since 1997 as an advanced flying trainer. Operated by the Defence Helicopter Flying School at RAF Shawbury and the Search and Rescue Training Unit at RAF Valley.
Bell 412SP Griffon
Standard Model with P&WC PT6T-3B
Special Performance version with P&WC PT6T-3BF engines
Enhanced performance version with P&WC PT6T-3DF engines
Glass cockpit version with P&WC PT6T-9 electronic controlled engines
Bell 412SP Griffon: Specifications
Role Multipurpose utility helicopter
National origin United States/Canada
Manufacturer Bell Helicopter
Status In service
Primary users Royal Air Force
See Operators for others
Number built Over 869
Developed from Bell 212
Variants Bell CH-146 Griffon
Crew: one-two pilots
Capacity: up to 13 passengers, maximum external load of almost 6,614 lb (3,000 kg)
Length: 56 ft 1 in (17.1 m) Height: 15 ft (4.6 m)
Empty weight: 6,789 lb (3,079 kg) Max. takeoff weight: 11,900 lb (5,397 kg)
Fuselage length: 43 ft (13.1 m)
Powerplant: 1 × Pratt & Whitney Canada PT6T-3D or PT6T-3DF Twin-Pac turboshafts, 1,250 shp Performance
Maximum speed: 140 knots (161 mph, 259 km/h)
Cruise speed: 122 knots (140 mph, 226 km/h)
Range: 609 mi (up to 980km)0 ft/min (6.86 m/s)
Bell 412SP Griffon
The Bell 412 is a twin-engine utility helicopter of the Huey family manufactured by Bell Helicopter. It is a development of the Bell 212, with the major difference being the composite four-blade main rotor.