| XR-9 | |
|---|---|
 | |
| Role | Utility helicopter |
| Manufacturer | Firestone Aircraft Company |
| First flight | March 1946 |
| Primary user | United States Army Air Forces |
| Number built | 2 |
The Firestone XR-9, also known by the company designation Model 45, is a 1940s American experimental helicopter built by the Firestone Aircraft Company for the United States Army Air Forces. Only two (the military XR-9B and one civil example) were built.
Originally developed by G & A Aircraft with the co-operation of the United States Army Air Forces' Air Technical Service Command, the G & A Model 45B (designated XR-9Rotocycle by the Army) [1] was a design for a single-seat helicopter of pod-and-boom configuration. [2] It had a fixed tri-cycle landing gear and three-bladed main and tail rotors. Power would have been supplied by a 126 hp (94 kW) Avco Lycoming XO-290-5 engine. [3] The Model 45C (XR-9A) was the same helicopter with a two-bladed rotor. Neither of the two helicopters were built. G & A Aircraft was purchased by Firestone in 1943, [3] and was renamed the Firestone Aircraft Company in 1946. [4]
A revised two-seat design the revised Model 45C (or XR-9B) was built with a three-bladed main rotor and two-seat in tandem. The first aircraft procured by the Army Air Forces in 1946, [3] it was powered by an Avco Lycoming O-290-7 engine [3] and first flew in March of that year.
A civil version, the Model 45D was also built and flown, in anticipation of a postwar boom in aircraft sales. [3] This differed in having the two occupants side-by-side instead of tandem as in the 45C, and was equipped with a 150 horsepower (110 kW) Lycoming engine. [3] The prototype was demonstrated at the 1946 Cleveland National Air Races. [5] A four-seat Model 50, with twin tail rotors, was also projected, [3] but the predicted sales boom did not materialise, and Firestone closed its aircraft manufacturing division. [3]
United States 
The sole Model 45D is on display (without blades installed) at the United States Army Aviation Museum at Fort Novosel, Alabama.
Data from Jane's all the World's Aircraft 1947, [6] [7]
General characteristics
Performance
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Media related to Firestone XR-9 at Wikimedia Commons