History
This aircraft is descending via the Bell 212 from the well-known Bell UH-I.
This twin-engined version was developed in co-operation with Pratt & Whitney Canada as a result of a request of the Canadian Government.
This request was followed by an order for 50 examples of Bell model 212, which received the Canadian designation CUH-1N and were delivered in 1971 and 1972. later the designation was changed in CH-1235. Later further orders were received from the USAF, US Navy and the US MC.
Also a commercial civil variant was developed, known as the Bell Twin Two Twelve.
The Bell 412 is a variant of this 212, but equipped with four rotor blades.
Development start by the end of the seventies. The rotor had a smaller diameter. The prototype made its maiden flight in august 1979.
A variant was the Bell 412SP (Special Performance) with an enlarged fuel capacity and a higher take-off weight.
The Bell 412HP (High Performance) was a variant of the 412Sp with an improved transmission.
The Bell 412EP (Enhanced Performance) is equipped with a double automatic, digital flight control system.
Bell built over 700 examples and over 260 examples were license built by Agusta-Westland, Italy.
An overview of the variants:
- CH-146 Griffon:
- A (Canadian built) Utility transport helicopter.
- Bell Griffin HT1:
- Trainer the RAF.
- Bell Griffin HAR2:
- A SAR-version based upon the Bell 412EP.
- Agusta-Bell AB 412:
- Built by Agusta-Bell, Italy.
- Agusta-Bell AB 412EP:
- Built by Agusta-Bell, Italy.
- Agusta-Bell AB 412SP:
- Built by Agusta-Bell, Italy.
- Agusta-Bell AB 412 Grifone:
- Built by Agusta-Bell, Italy military transport version.
- Agusta-Bell AB 412 CRESO:
- Built by Agusta-Bell, Italy, equipped with ground search radar.
- NBell 412:
- License built IPTN version.
| Dimensions: | |||
| Length with rotor | Rotor diameter: | 14 m | |
| Height: | 4,6 m | Tail Rotor diameter: | 2,6 m |
| Weights: | |||
| Empty weight: | 2935 kg | Full weight: | 5400 kg |
| Performances: | |||
| Max. speed: | 255 km/hr | Cruising speed: | 216 km/hr |
| Range: | 650 km | Service ceiling: | |
| Engine type: | Two Pratt & Whitney PT6T-3B rated 970 hp each | ||
| Crew: | Two airmen; one hoist operator; one frog man and one medic. | ||
| Passengers | Thirteen (sitting) passengers | ||
| Equipment | Medical equipment: one stretcher, oxygen panel + ventilator, propaq.suction unit. Defibrilator first aid bag, connection capacity incubator. Communication means: VHF (e.g. for contact with central ambulance station) Navigational aids: VOR, TACAN, ILS; ADF, Doppler, GPS, R-NAV, Weather Radar. Other equipment: Nightsun searchlight (1600 watts), life raft for 10 people, automatically inflatable floats for emergency landings on water |
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