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


The first Hillers H-23B entered service in June 1955 and were transferred to 298 squadron.
During May 1956 some were transferred to 299 squadron.
All Hillers were in fact property of the Netherlands Army and part of GPLV (Groep Lichte Vliegtuigen = Group Light Aircraft), but they were flown and under maintenance by the RNlAF.
Initially squadron codes were applied, but from 1959 these were replaced with the serials.
All Hillers were received under MDAP (Mutual Defence Assistance program) conditions.
May 1959 an extra aircraft was delivered, registered O-36. This was a H-23C.

N89 01 17

Hiller OH-23 O-36, photographed in 1989 at the Militaire Luchtvaart Museum at Soesterberg.



Serial overview

2nd Serial
2nd Serial
US Fisc. Year nr.
US Fisc. Year nr.
Constr. nr.
Constr. nr.
Date in service
Date in service
Date out of service
Date out of service
8A-201 O-1 54-2935 729 06-1955 04-1965 Became N 7299
8A-205 O-2 54-2936 730 06-1955 04-1965 Became D-HAMU
8A-203 O-3 54-2937 731 06-1955 12-1965 Became N42937
8A-206 O-4 54-2938 732 06-1955 06-1965 To Turkey
8A-204 O-5 54-2939 733 06-1955 06-1965 Became N8505
8A-200 O-6 54-2940 734 06-1955 01-1965 Out of service 1965
8A-202 O-7 54-2941 735 06-1955 06-1965 8A-202; became N8506
8A-207 O-8 54-2942 736 10-1955 06-1965 Became G-AYCI
8A-208 O-9 54-2943 737 10-1955 12-1965 Out of service 1966
8A-209 O-10 54-2944 738 09-1955 21-03-1958 Written off.
8A-210 O-11 54-2945 739 10-1955 04-1965 Became D-HFNA
8A-211 O-12 54-2946 740 09-1955 01-1965 To Turkey mid 1965
8A-212 O-13 54-2947 741 09-1955 01-1965 Remains to USAFE Disposal Yard SSB
8A-213 O-14 54-2948 742 10-1955 25-04-1956 Written off 06-1956 after accident near Stroe
8A-214 O-15 54-2949 743 12-1955 06-1965 Became N8507
O-16 54-862 675 11-1958 12-1965 Became N43677
O-17 54-863 676 11-1958 06-1965 Became N8504
O-18 54-864 677 11-1958 12-1965 To Army AviationSchool, Fort Rucker
O-19 54-865 678 11-1958 12-1965 Became N 9885
8A-218 O-20 54-866 679 01-1957 12-1965 To Army Aviation School, Fort Rucker
  O-21 54-867 681 11-1958 06-1965 Became N8503, D-HGAG
  O-22 54-868 682 12-1958 12-1965 Became N4724, N25PC
8A-220 O-23 54-869 683 03-1957 06-1965 Became OH-HHA
O-24 54-870 684 11-1958 12-1965 Became N4725
8A-221 O-25 54-871 685 05-1957 12-1965 To Army Aviation School, Fort Rucker
  O-26 54-872 687 11-1958 06-1965 Became G-AYCH
  O-27 54-873 688 11-1958 12-1965 To Army Aviation School, Fort Rucker
  O-28 54-874 689 10-1958 05-1965 Remains to USAFE Disposal Yard SSB??
  O-29 54-875 690 12-1958 12-1965 To Army Aviation School, Fort Rucker
  O-30 54-876 693 12-1958 12-1965 To Army Aviation School, Fort Rucker
8A-219 O-31 54-877 694 01-1957 12-1965 Became N4877A
8A-222 O-32 51-16411 664 03-1957 12-1965  
8A-216 O-33 51-16412 665 04-1956 04-1965 Remains to USAFE Disposal Yard SSB
8A-217 O-34 51-16413 666 04-1956 06-1965 Became OH-HHB
8A-215 O-35 51-16414 669 01-1956 04-1965 Became G-AWKG
  O-36 57-6521 937   04-1965 OH-23C; Preserved and went to MLM


Scale 1/72

  • Special Hobby
    • Kit 72017: A model of a Hiller UH-12C.

(Building and Conversion of the Special Hobby UH-12 in 1/72nd scale by Jan Brussaard:

A couple of years ago I bought the Hiller UH-12 model from Special Hobby. It proved to be a different type than the Hille used in Dutch military service. I started looking for photo's and other information and found this site Aircraft Walk-Around Hiller UH-12C Militaire Luchtvaart Museum.

This is a complete photo report of the Hiller UH-12C, which is preserved in de Dutch military Aviation museum at Soesterberg. This was the sole UH-12C used in Dutch service, all other 35 models were of the type UH-12B, so a new canopy had to be made from scratch. I produced a mould for this new canopy.
The floor, part nos 4, 14, 15, 16, 17, 25 and 27 were glued together as instructed. The seat on part 25 is a for two persons, the one used by the Dutch was one for three persons, two crew members and a passenger, so a new one was made.

Next step was to double the steering. The seat was split in two parts by sawing a gap in it. A second part no 23 was made, a stick an pedals were added to both sides of the instrument panel.
Both sticks, parts no.24 were not in the floor, both placed in the front of the seat, so two new parts 23 were made from pieces electrical wire. As grips part of the isolation material was used. I drilled a hole in the front of the seat and glued one part no 23 in it.

Next another piece of wire was used to realize a transmission just behind the back of the cabin, to connect both steering sticks, pats no 23. Check photos for this step of the conversion.
The Hiller in the Museum has instruments just in front of the console on the floor. The B model had these instruments placed besides the console, just like the model.
The floor was was modified to fit the new canopy. Note the floor ended to the front, the floor of the museum Hiller is open at the front.

next step was the engine. This didn't fit. Is used wire of different thickness to make a new holding frame. The resin parts added to the kit I thought un usable.
By checking photos I made several smaller parts for the engine. The hose for the cockpit heating was added.

Boom no. 6 and 7, was glued together and added . At the rear I removed the skew part. Part no No. 5 was useless and a new one was made from several pieces of wire. At the end of the tail gear boxes etc were added.

Note the tail rotor was positioned to the right side of the machine, not to the left! I added steering wires etc. to the model.
According to photographs a battery and other smaller parts were added.
The doors of the kit were modified to fit in the new canopy.

Photo's of the result can be seen at: Hiller UH-12B Jan Brussaard

Hiller OH 23C Raven AKleijn
A model of a Hiller OH-23C, built by Adri Kleijn.


Modeling add-on

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Scale 1/48

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SchemaColour nameRAL-numnerFS-nummerHumbrolXtraColorVallejo Model ColorNotes
delivery scheme first seriesOverall Olive Drab ANA613 - 34088 66 X-111 - 70.889  
Delivery schem Second seriesOverall Dark green, Matt 19 -   116 X-110 70.893 71.016 Serials White
later the aircraft of the first series were after overhaul, sprayed in Dark Green.
Some Hiller used by HVO (Helikopter VliegOpleiding = helicopter Training unit) had Day glo parts.(source: Camouflage en Kentekens…)

According to some painters of air base Ypenburg some Hillers wore a camouflage pattern of dark green and khaki. (Source: Camouflage en Kentekens…)

For an extended conveersiontable with many colour and paint systems, check

Hiller UH23B 1 SMALL
Hiller UH-23B: delivery scheme, overall US Olive drab.
Hiller UH23B 1 SMALL
Hiller UH-23B: overall dark green.
Hiller UH23C 1 SMALL
Hiller UH-23C: overall US olive drab.




Dutch Military Aviation 1945-1978 Paul A. Jackson Pag. 88 1978 Uitgever: Midland Countries Publications, Leicester
Nederlandse Militaire Luchtvaart in Beeld. deel 2 Hugo Hooftman Pag. 124 - 125 1978 Uitgever: Europese Bibliotheek, Zaltbommel
Squadrons van de Koninklijke Luchtmacht Willem Helfferich Pag. 63 1983 Uitgever: Unieboek b.v., Houten
KLu Vliegtuigen: De vliegtuigen van de Koninklijke Luchtmacht vanaf 1913 Wim Schoenmaker & Thijs Postma Pag. 119 1987 Uitgeverij De Alk, Alkmaar
Van Luchtvaartafdeling tot Koninklijke Luchtmacht 75 jaar Militaire Luchtvaart in Nederland Koos van de Berg Pag. 42 1987 Uitgever: Rebo Produkties, Sassenheim
Camouflage en Kentekens J. Greuter e.a.   1997 Uitgeverij Bonneville, Bergen (NH)



Special thanks to mr J. Brussaard for the information and especially the nice photos and for the conversion and building report of the Special Hobby Hiller.