Hiller OH-23 Raven
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Hiller OH-23 Raven
L'histoire de cet hélicoptère sur wikipedia :
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The [Vous devez être inscrit et connecté pour voir ce lien] OH-23 Raven was a three-place, light observation [Vous devez être inscrit et connecté pour voir ce lien] based on the Hiller Model 360.
The Model 360 was designated by the company as the UH-12 ("UH" for [Vous devez être inscrit et connecté pour voir ce lien]),[Vous devez être inscrit et connecté pour voir ce lien] which was first flown in 1948.
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The [Vous devez être inscrit et connecté pour voir ce lien] OH-23 Raven was a three-place, light observation [Vous devez être inscrit et connecté pour voir ce lien] based on the Hiller Model 360.
The Model 360 was designated by the company as the UH-12 ("UH" for [Vous devez être inscrit et connecté pour voir ce lien]),[Vous devez être inscrit et connecté pour voir ce lien] which was first flown in 1948.
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Re: Hiller OH-23 Raven
Development
[Vous devez être inscrit et connecté pour voir ce lien] built and flew his first helicopter, the Hiller XH-44, when he was 19.
With the help of shipping mogul [Vous devez être inscrit et connecté pour voir ce lien], Hiller established the United Helicopters company in 1946.
In 1947, United Helicopters developed the Model 360X, the prototype that would become the basis for the H-23.
A year later, on 14 October 1948 the [Vous devez être inscrit et connecté pour voir ce lien] issued a production certificate for the Model 360.
United Helicopters began producing the Model 360 as the UH-12.
[Vous devez être inscrit et connecté pour voir ce lien] built and flew his first helicopter, the Hiller XH-44, when he was 19.
With the help of shipping mogul [Vous devez être inscrit et connecté pour voir ce lien], Hiller established the United Helicopters company in 1946.
In 1947, United Helicopters developed the Model 360X, the prototype that would become the basis for the H-23.
A year later, on 14 October 1948 the [Vous devez être inscrit et connecté pour voir ce lien] issued a production certificate for the Model 360.
United Helicopters began producing the Model 360 as the UH-12.
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Re: Hiller OH-23 Raven
In 1949, the UH-12 became the first helicopter to make a transcontinental flight from California to New York.
When Hiller upgraded the engine and the rotor blades, the company designated the new model the UH-12A.
It was the UH-12A that would be adopted by both the French and United States militaries.
When Hiller upgraded the engine and the rotor blades, the company designated the new model the UH-12A.
It was the UH-12A that would be adopted by both the French and United States militaries.
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Re: Hiller OH-23 Raven
Operational history
The H-23 Raven performed as a utility, observation, and MedEvac helicopter during the [Vous devez être inscrit et connecté pour voir ce lien].
Model numbers ranged A through D, F and G.
The H-23A had a sloping front windshield. The H-23B was used as a primary helicopter trainer.
Beginning with the UH-23C, all later models featured the "Goldfish bowl" canopy similar to the [Vous devez être inscrit et connecté pour voir ce lien], it also featured a unique cyclic control system, through two paddles offset 90 degrees to the main rotor blades.
The OH-23 had a speed of 97 mph (84 knots).
The Raven had a two-bladed main rotor, a metal two-bladed tail rotor.
Both the OH-23B and the OH-23C were powered by one [Vous devez être inscrit et connecté pour voir ce lien]-5D engine.
The H-23 Raven performed as a utility, observation, and MedEvac helicopter during the [Vous devez être inscrit et connecté pour voir ce lien].
Model numbers ranged A through D, F and G.
The H-23A had a sloping front windshield. The H-23B was used as a primary helicopter trainer.
Beginning with the UH-23C, all later models featured the "Goldfish bowl" canopy similar to the [Vous devez être inscrit et connecté pour voir ce lien], it also featured a unique cyclic control system, through two paddles offset 90 degrees to the main rotor blades.
The OH-23 had a speed of 97 mph (84 knots).
The Raven had a two-bladed main rotor, a metal two-bladed tail rotor.
Both the OH-23B and the OH-23C were powered by one [Vous devez être inscrit et connecté pour voir ce lien]-5D engine.
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Re: Hiller OH-23 Raven
The OH-23D was a purely military version with a 0-435-23C engine and a more reliable transmission.
Most OH-23Ds were replaced by the OH-23G, the most common version of the Raven, with a more powerful [Vous devez être inscrit et connecté pour voir ce lien]-9A six-cylinder, horizontally opposed, air cooled 305 hp engine.
The OH-23G could seat three.
The [Vous devez être inscrit et connecté pour voir ce lien] version carried two external skid-mounted litters or pods.
Most OH-23Ds were replaced by the OH-23G, the most common version of the Raven, with a more powerful [Vous devez être inscrit et connecté pour voir ce lien]-9A six-cylinder, horizontally opposed, air cooled 305 hp engine.
The OH-23G could seat three.
The [Vous devez être inscrit et connecté pour voir ce lien] version carried two external skid-mounted litters or pods.
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Re: Hiller OH-23 Raven
The Raven saw service as a scout during the early part of the Vietnam war before being replaced by the [Vous devez être inscrit et connecté pour voir ce lien]
in early 1968.
The Raven could be armed with twin M37C .30 Cal. machine guns on the XM1 armament subsystem or twin M60C 7.62 mm machine guns on the M2 armament subsystem.
The XM76 sighting system was used for sighting the guns.
The Royal Navy used Hiller 12E's for many years as its basic helicopter trainer - at 705 Sqn based at RNAS Culdrose in Cornwall, England.
in early 1968.
The Raven could be armed with twin M37C .30 Cal. machine guns on the XM1 armament subsystem or twin M60C 7.62 mm machine guns on the M2 armament subsystem.
The XM76 sighting system was used for sighting the guns.
The Royal Navy used Hiller 12E's for many years as its basic helicopter trainer - at 705 Sqn based at RNAS Culdrose in Cornwall, England.
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- Messages : 539
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Re: Hiller OH-23 Raven
H-23A
Initial production version with 178 hp (133 kW) [Vous devez être inscrit et connecté pour voir ce lien]-4 piston engine and two-seat cockpit, 100 built for the US Army[Vous devez être inscrit et connecté pour voir ce lien] and 5 for evaluation by the US Air Force.[Vous devez être inscrit et connecté pour voir ce lien]
Initial production version with 178 hp (133 kW) [Vous devez être inscrit et connecté pour voir ce lien]-4 piston engine and two-seat cockpit, 100 built for the US Army[Vous devez être inscrit et connecté pour voir ce lien] and 5 for evaluation by the US Air Force.[Vous devez être inscrit et connecté pour voir ce lien]
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Re: Hiller OH-23 Raven
H-23B
H-23A with skid/wheel undercarriage and 200 hp (149 kW) O-335-6 engine (some later re-engined with a 250 hp VO-435-23B), re-designated OH-23B in 1962, 273 built for the US Army and 81 for military export.
H-23A with skid/wheel undercarriage and 200 hp (149 kW) O-335-6 engine (some later re-engined with a 250 hp VO-435-23B), re-designated OH-23B in 1962, 273 built for the US Army and 81 for military export.
Paden- CLUB
- Messages : 539
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Re: Hiller OH-23 Raven
H-23C
Model UH-12C with three-seat cabin, one-piece canopy and metal rotor blades, 145 built for the US Army.
Re-designated OH-23C in 1962.
Model UH-12C with three-seat cabin, one-piece canopy and metal rotor blades, 145 built for the US Army.
Re-designated OH-23C in 1962.
Paden- CLUB
- Messages : 539
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Re: Hiller OH-23 Raven
H-23D
H-23C with new rotor, transmission and 250 hp (187 kW) Lycoming VO-435-23B engine, 348 built for US Army. Re-designated OH-23D in 1962.
H-23C with new rotor, transmission and 250 hp (187 kW) Lycoming VO-435-23B engine, 348 built for US Army. Re-designated OH-23D in 1962.
Paden- CLUB
- Messages : 539
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Re: Hiller OH-23 Raven
H-23E
Model UH-12E, not bought
H-23F
Model UH-12E-4, four-seat model with 25-inch cabin extension and a 305hp VO-540-A1B engine, redesignated OH-23F in 1962, 22 built for US Army.
Model UH-12E, not bought
H-23F
Model UH-12E-4, four-seat model with 25-inch cabin extension and a 305hp VO-540-A1B engine, redesignated OH-23F in 1962, 22 built for US Army.
Paden- CLUB
- Messages : 539
Localisation : Région parisienne
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aeronewsline :: Accueil :: Histoire :: Aéronefs 1945 à 1955
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