Nederlandse Modelbouw en Luchtvaartsite

Dutch Modelling and Aviation

In Memoriam

Klaas Willem Jonker
† April 30, 2018

On Monday 30 April 2018, Wilko Jonker died after a long illness at the age of 58. He leaves behind a wife and two children. The Dutch military aviation and plastic modeling were his hobby and on this website he shared all the knowledge he has collected over the years. His hobby has been able to distract him from the persistent disease in his body until the last week of his life. The contacts with other hobbyists were a major support for him.

This website will be maintained by different people for as long as possible, so that other enthusiasts can continue to benefit from extensive content.

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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.


Technical Information
Length with rotor   Rotor diameter: 14 m
Height: 4,6 m Tail Rotor diameter: 2,6 m
Empty weight: 2935 kg Full weight: 5400 kg
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