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Bell R-12
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| R-12 (Model 48) | |
|---|---|
| Type | five/eight seat utility helicopter |
| Manufacturer | Bell Helicopter |
| Maiden flight | 1946 |
| Primary user | United States Air Force |
| Number built | 13 |
| Developed from | Bell 47 |
The Bell R-12 (Model 48) was an American 1940s utility built by Bell Helicopter company.
Contents
Development
During 1946 began developed of an enlarged version of the Model 47. Two prototypes were ordered by the United States Air Force as the XR-12. It was powered by a Pratt & Whitney Pratt & Whitney R-1340 radial engine and seated five. Another prototype (the XR-12B) with a more powerful R-1340 and seats for eight was also ordered. With a change in designation system the helicopter was re-designated the H-12. Test were not satisfactory and ten pre-production and 34 production aircraft were cancelled.
Variants
- XR-12
- prototype, redesignated XH-12, two built.
- R-12A
- production version, 34 on order cancelled.
- XR-12B
- prototype with more powerful engine and increased seating, re-designated XH-12B, one built.
- YR-12B
- as XR-12B but with R-1340-55 engines, re-designated YH-12B, ten built.
- XH-12
- XR-12 re-designated in 1947.
- XH-12B
- XR-12B re-designated in 1947.
- YH-12B
- YR-12B re-designated in 1947.
Operators
Specifications (XR-12B)
This aircraft article is missing some (or all) of its specifications. If you have a source, you can help Wikipedia by adding them.General characteristics
- Crew: 4
- Length: ()
- Rotor diameter: 47 ft 6 in (14.48 m)
- Height: ()
- Disc area: 1,772 ft² (164.62 m²)
- Max takeoff weight: 6,286 lb (2851 kg)
- Powerplant: 1× Pratt & Whitney R-1340-55 Wasp radial piston, 600 hp (447 kW)
- Propellers: 1 rotor, 1 per engine
Performance
- Maximum speed: 105 mph (169 km/h)
- Cruise speed: 90 mph (145 km/h)
- Range: 300 miles (483 km)
References
- Andrade, John M. U.S.Military Aircraft Designation and Serials since 1909. Leicester, UK: Midland Counties Publications, 1979. ISBN 0-904597-22-9.
- The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). London, Orbis Publishing.
External links
See also
Designation sequence
Lists relating to aviation | |
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| General | Timeline of aviation · Aircraft · Aircraft manufacturers · Aircraft engines · Aircraft engine manufacturers · Airports · Airlines |
| Military | Air forces · Aircraft weapons · Missiles · Unmanned aerial vehicles (UAVs) · Experimental aircraft |
| Notable incidents and accidents | Military aviation · Airliners · General aviation · Famous aviation-related deaths |
| Records | Flight airspeed record · Flight distance record · Flight altitude record · Flight endurance record · Most produced aircraft |
Lists relating to aviation | |
|---|---|
| General | Timeline of aviation · Aircraft · Aircraft manufacturers · Aircraft engines · Aircraft engine manufacturers · Airports · Airlines |
| Military | Air forces · Aircraft weapons · Missiles · Unmanned aerial vehicles (UAVs) · Experimental aircraft |
| Notable incidents and accidents | Military aviation · Airliners · General aviation · Famous aviation-related deaths |
| Records | Flight airspeed record · Flight distance record · Flight altitude record · Flight endurance record · Most produced aircraft |
| This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bell R-12". |
