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Bell 48 / XR-12B helicopter

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Specifications Comment this helicopter
Picture 48__XR-12B
General
Manufacturer Bell
Type 48 / XR-12B
Introduced 1/1/1946
In production? No
Units produced 13
Price US $ 175,000.00
Dimensions
Overall Length 56.8 ft
Length 39.6 ft
Height 11.3 ft
Width 0 ft
   
   
Description This light, single piston engine helicopter used the rotor system of the Bell 47, although the machine itself was much bigger. There were two variants, a civilian version called Model 42 and the military Model 48. The latter was a response to the US Air Force demand for a military utility helicopter, which became designated as the XR-12.

Bell developed (1946) two versions of Model 48, the XR-12 and the YR-12. The first version had a nose section and doors that looked very much like those used in a car. The YR-12, meanwhile, had quite a different nose section, with a lot of glass and doors that fit in the fuselage very naturally. This version also used a more powerful engine, while the three-cycle landing gear was replaced with a quad-cycle version.

These models were not, however, successful, with all of them having major problems with the rotor system. By the time these issues were resolved, the US Air Force had already cancelled its order and was considering purchasing the Sikorsky S-51.

A minor spin-off was the (Italian) Agusta-Bell AB102, which used the Model 48 technology with a fuselage design of its own. Only two production models were built and sold. This all took place in the early 1960s, by which time the turbine helicopter was already dominating this market segment. As it turned out, the AB102 was already obsolete at the time of its introduction.
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Design features
  • Large two-blade rotor with stabilizer bar
  • Four wheels undercarriage
Description
This light, single piston engine helicopter used the rotor system of the Bell 47, although the machine itself was much bigger. There were two variants, a civilian version called Model 42 and the military Model 48. The latter was a response to the US Air Force demand for a military utility helicopter, which became designated as the XR-12.

Bell developed (1946) two versions of Model 48, the XR-12 and the YR-12. The first version had a nose section and doors that looked very much like those used in a car. The YR-12, meanwhile, had quite a different nose section, with a lot of glass and doors that fit in the fuselage very naturally. This version also used a more powerful engine, while the three-cycle landing gear was replaced with a quad-cycle version.

These models were not, however, successful, with all of them having major problems with the rotor system. By the time these issues were resolved, the US Air Force had already cancelled its order and was considering purchasing the Sikorsky S-51.

A minor spin-off was the (Italian) Agusta-Bell AB102, which used the Model 48 technology with a fuselage design of its own. Only two production models were built and sold. This all took place in the early 1960s, by which time the turbine helicopter was already dominating this market segment. As it turned out, the AB102 was already obsolete at the time of its introduction.
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Design features:
  • Large two-blade rotor with stabilizer bar
  • Four wheels undercarriage
Performance
Persons 10
Max. Range 300 mi
Cruise Speed 90 mph
Max. Speed 105 mph
Max. rate of Climb 450 ft/min
HOGE ceiling 0 ft
Service Ceiling 12800 ft
Gross Weight 6286 lb
Empty Weigt 0 lb
Useful Load 0 lb
Dynamic system
Fuel Capacity 0 gallons
Number of Engines 1
Engine Type Piston
Engine Code Pratt & Whitney R-1340-55 Wasp
Horse Power 600
Rotorhead Teetering
Number of rotorblades 2
Rotor Diameter 47.5 ft
Number of tail rotorblades 2
Tailrotor Diameter 0 ft
Blueprints & model
Manufacturer Website manufacturer..
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