Bell UH-1 Iroquois variants

The Bell UH-1 Iroquois military helicopter, first introduced in 1959, is the first production member of Bell Helicopter's prolific Huey family of helicopters, and was itself developed in over twenty variants, which are listed below. == 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.