Nederlandse Modelbouw en Luchtvaartsite

Dutch Modelling and Aviation

In Memoriam

Klaas Willem Jonker
† April 30, 2018

On Monday 30 April 2018, Wilko Jonker died after a long illness at the age of 58. He leaves behind a wife and two children. The Dutch military aviation and plastic modeling were his hobby and on this website he shared all the knowledge he has collected over the years. His hobby has been able to distract him from the persistent disease in his body until the last week of his life. The contacts with other hobbyists were a major support for him.

This website will be maintained by different people for as long as possible, so that other enthusiasts can continue to benefit from extensive content.

Hiller OH-23 Raven


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.


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.


Technical information Hiller UH-23B
Length with rotor 8,8 m Height: 7,7 m
Rotor diameter 2,5 m Tail Rotor diameter - m2
Empty weight: 457 kg Full weight: 839 kg
Max. speed: 153 km/hr Cruising speed: 135 km/hr
Range: 330 km Service ceiling: 4025 m
Engine: One Franklin 0-335-6 rated 250 hp
Crew: Two men: one aviator plus one observer