Nederlandse Modelbouw en Luchtvaartsite
Dutch Modelling and Aviation
Hiller OH-23 Raven
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History
The Hiller UH-12 was a development of the Hiller Model 360 from 1948. It was equipped with a Franklin 6V4-178-B33 engine rated 175 hp. This type made the first transcontinental commercial helicopter flight.
With another engine and new rotor blades the UH-12 was bought by the US Army under the designation UH-12A . Its military designation was H-23 Raven. The US Navy also used the type with Naval designation HTE-1, mainly as a trainer.
Versies
- The H-23B:
- was equipped with a more powerful Franklin 6V4-200-C33 engine rated 200-210 hp. 216 examples of this type were used by the US Army as H-23B for training purposes and another 237 examples were used for general purposes.
- The UH-12B:
- This type could have skids or floats. The US Navy ordered a series under the designation HTE-2 equipped with wheels.
- The UH-12C:
- was released in 1955 and had the same engine, but full metal rotor blades and Bell 47 like canopy. 156 examples were delivered to the US Army under the designation H-23C.
- The OH-12D:
- was a fully military version was released in 1956, 483 of this type were used by the US Army. The engine was a more powerful Lycoming VO-540 rated 320 hp and also the transmission was modified and improved.
- The UH-12E:
- the best known version was equipped with a more powerful engine. The US Army used this type under the designation OH-23G to replace all Hillers OH-23D.
- The UH-12E:
- In 1960 a four seat version was released as Model E4, with an enlarged cabin and revised stabilizer. The US Army used 23 of this type under the designation OH-23F.
Dimensions: | |||
Length with rotor | 8,8 m | Height: | 7,7 m |
Rotor diameter | 2,5 m | Tail Rotor diameter | - m2 |
Weights: | |||
Empty weight: | 457 kg | Full weight: | 839 kg |
Performances: | |||
Max. speed: | 153 km/hr | Cruising speed: | 135 km/hr |
Range: | 330 km | Service ceiling: | 4025 m |
Miscellaneous: | |||
Engine: | One Franklin 0-335-6 rated 250 hp | ||
Crew: | Two men: one aviator plus one observer | ||