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Bell UH-1 Iroquois variants
:''For an overview of the whole Huey family of aircraft see Bell Huey family''
The following is an extensive catalog of the variants and specific unique elements of each variant and/or design stage of the UH-1 Iroquois transport helicopter.
==XH-40 and YH-40==
The first Bell helicopter to use a turbine engine was a modified Model 47 (designated XH-13F), which had its initial flight in October 1954. The U.S. Army began a competition for a new helicopter for general utility and medical/casualty evacuation in 1955. In June 1955, Bell Helicopter was awarded a contract to develop the next generation turbine-powered utility helicopter for the U.S. Army. The resulting Bell Model 204 was designated XH-40 by the U.S. military and first flew on 22 October 1956. Two more prototypes were built in 1957, and six YH-40 pre-production helicopters were delivered in 1958.〔Donald, David, ed. "Bell 204". "Bell 205". ''The Complete Encyclopedia of World Aircraft''. Barnes & Nobel Books, 1997. ISBN 0-7607-0592-5.〕 The YH-40's cabin was lengthened by, and had more ground clearance compared to the XH-40.〔Eden, Paul, ed. "Bell UH-1 Iroquois". ''Encyclopedia of Modern Military Aircraft''. Amber Books, 2004. ISBN 1-904687-84-9.〕
Bell believed the YH-40 was ideal for troop transport and cargo carrying as well as the medevac role, a view soon adopted by the Army; they found the pre-production aircraft so much better in service than previous piston-powered helicopters they soon ordered more.
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