Development Bell 204/205

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a bell xh-40, prototype of uh-1 , bell 204


bell designed model 204 in response 1955 united states army requirement utility helicopter. 204 giant step forward in helicopter design, being 1 of first powered turboshaft. turboshaft engine radically improved practicality of helicopter due light weight , high power-to-weight ratio, lower fuel consumption, , lower maintenance , operating costs. use of turboshaft in 204 allowed carry useful payload on respectable ranges , @ reasonable speeds, resulted in 204 , subsequent 205 becoming successful western helicopter series in terms of numbers built.


the civil 204b first delivered in 1961. subsequent model 205a-1 equivalent uh-1h, which, compared 204, longer, larger, , has better performance , more powerful engine.


over 60 civil model 204b helicopters had been delivered 1967, while further examples built agusta-bell until 1973. 12,000 model 205s (including civil 205a-1s) built bell , agusta-bell 1980s. numerous ex-military 204s , 205s converted commercial use.








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