The Model 505 Jet Ranger X was designed as a replacement for the Model 206 JetRanger in the Bell fleet of helicopters, it being class as a clean-sheet design which uses some dynamic components, of the Bell 206L4.

The Bell Model 212, known as the Twin Two-twelve, was developed from, and based on, the Model 205 Iroquois.

The Bell 214 series was announced by Hell Helicopter in 1970 as a development of the Bell 205 and basically involved the installation of a Lycoming T53-L-702 engine providing 1,417 kw (1,900 shp) engine and a prototype 214A (c/n 27004) became a demonstrator which was evaluated by the Imperial Iranian

The Bell Model 214ST (ST for super transport) was a development of the Model 214B (known as the Biglifter) and replaced that model on the production line in early 1981, deliveries of 214STs to customers beginning in early 1982.

Probably one of the most, if not the most, produced helicopters in the world, the Bell 47 series began when the Bell Aircraft Corporation commenced the development of helicopters in 1941 and flew the first of five experimental two-seat prototypes in 1943, the first being known as the Model 30

The prototype of the Ecureuil (Squirrel) light utility helicopter, powered by a Lycoming LTS 101 turboshaft, was flown for the first time on 27 June 1974. On 14 February 1975, the second prototype was flown, powered by the French Arriel turboshaft. The type subsequently entered production France at an initial

This light single-seat helicopter was built in the Melbourne suburb of Black Rock and is believed to have been completed in about 1948. It took about two-years to complete and is thought to be, if not the first, one of the first helicopters designed and built in Australia.

In the 1950s Messrs T G Adams and Paul Wilson in California designed and developed a single-seat light sporting helicopter for private use. After a prototype was completed and tested, they produced plans for construction of the machine, then known as the Adams Wilson Hobbycopter, for sale to amateur constructors.