Hiller OH-23 Raven

Last updated
OH-23 Raven
OH-23 inflight colour photo.jpg
Hiller OH-23G Raven
RoleMultipurpose light helicopter
Manufacturer United Helicopters
Hiller Aircraft
First flight1948
Introduction1948
StatusRetired
Primary users United States Army
Colombian Air Force
Royal Navy (UK)
Produced1948-1965
Number built2000+

The Hiller OH-23 Raven is two or three-place, military light observation helicopter based on the Hiller Model 360. The Model 360 was designated by the company as the UH-12 ("UH" for United Helicopters), [1] which was first flown in 1948. Initially it was two-place helicopter powered by a piston engine that entered service in the late 1940s, it went on to be a popular military and civilian light helicopter in the late 20th century. A Hiller UH-12 was the first helicopter to make a transcontinental flight across the USA, in 1949. It served in the Korean War with U.N. forces and also in Vietnam. It was an important early helicopter and was widely used internationally, and in U.K service it was called the Hiller HT Mk 1 and Mk 2; and the U.S. Navy also used it as the HTE-1 for training. It was sold commercially as the UH-12 (This was a company designation not military), though some military operators used the company designation. Some later models were designed for turbine power, and version with 4-seats was also sold. In Canada, UH-13E served the military as the CH-112 Nomad.

Contents

Hiller was taken over by Fairchild in 1964. A new company Hiller Aviation took over support of some UH-12 variants in the 1970s, and later became Rogerson Hiller. [2]

Development

In 1947, United Helicopters (later renamed Hiller Aircraft) developed the prototype Model 360X helicopter. A year later, on 14 October 1948 the Civil Aeronautics Authority (CAA) issued a production certificate for the Model 360. United Helicopters began producing the Model 360 as the UH-12. 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 as the UH-12A. The UH-12A would be adopted by both the French and United States militaries, as well as being used by civil commercial operators in several countries.

The helicopter began production in the late 40s and had a trial-by-fire in the Korean war, a lot of hard won lessons resulted in the B model, the UH-13B and production capacity was greatly increased in this period. [3]

It was produced until 1965, with over 2000 produced. [4]

Operational history

HTE-1 of the U.S. Navy, used for training, 1950 330-PS-683 (USN 707952) (19529141719).jpg
HTE-1 of the U.S. Navy, used for training, 1950

The H-23 Raven performed as a utility, observation, and MedEvac helicopter during the Korean War. 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 Bell 47.

The Raven used Hiller's "Rotor-Matic" cyclic control system, with two small servo rotor paddles offset 90 degrees to the main rotor blades. The paddles were attached to the control column, so that movement of the column would cause the pitch of the servo paddles to change, loading the main rotor blade so that the desired cyclic changes to the rotor occurred. [5] The OH-23 had a top speed of 97 mph (156 km/h; 84 kn). 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 Franklin O-335-5D engine.

The OH-23D was a purely military version with a Lycoming O-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 Lycoming O-540-9A six-cylinder, horizontally opposed, air-cooled 305 hp (227 kW) engine. The OH-23G could seat three. The MEDEVAC version carried two external skid-mounted litters or pods. The Raven saw service as a scout during the early part of the Vietnam War before being replaced by the Hughes OH-6A Cayuse in early 1968. A Raven piloted by Hugh Thompson, Jr. played a crucial role in curtailing the My Lai Massacre. [6] When a Raven of the 59th Aviation Company strayed north of the Korean DMZ in August 1969 it was shot down and the crew were kept prisoner until released on December 2. [7]

The Raven could be armed with twin M37C .30-caliber 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 aiming the guns.

The Royal Navy's No. 705 Training Squadron used Hiller HTE-2s for several years from 1953 and later operated Hiller 12E's for many further years as its basic helicopter trainer based at RNAS Culdrose located in Cornwall, England.

Variants

Royal Navy Hiller HTMk1 (HTE-2) of 705 Squadron in 1953 Hiller HT.1 XB474 FAA Stretton 25.07.53 edited-2.jpg
Royal Navy Hiller HTMk1 (HTE-2) of 705 Squadron in 1953
U.S. Army H-23B Raven Hiller UH-12 (H-23) bw.jpg
U.S. Army H-23B Raven


Military

YH-23
One Model UH-12A, modified with two-seat cabin and 178 hp Franklin engine for U.S. Army evaluation. [8]
H-23A
Initial production version with 178 hp (133 kW) Franklin O-335-4 piston engine and two-seat cockpit, 100 built for the U.S. Army [9] and 5 for evaluation by the U.S. Air Force. [10]
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 U.S. Army [9] and 81 for military export.
H-23C
Model UH-12C with three-seat cabin, one-piece canopy and metal rotor blades, 145 built for the U.S. Army. Re-designated OH-23C in 1962. [9]
H-23D
H-23C with new rotor, transmission and 250 hp (187 kW) Lycoming VO-435-23B engine, 348 built for U.S. Army. Re-designated OH-23D in 1962. [9]
H-23E
Model UH-12E, not bought
H-23F
Model UH-12E-4, four-seat model with 25-inch cabin extension and a 305 hp VO-540-A1B engine, redesignated OH-23F in 1962, 22 built for U.S. Army. [9]
H-23G
Three-seat dual control version of H-23F, redesignated OH-23G in 1962, 793 built. [9]
HTE-1
U.S. Navy version of the Model UH-12A with Franklin O-335 engine, two-seater with dual controls, and wheeled tricycle undercarriage, 17 built. [11]
HTE-2
U.S. Navy version of H-23B with Franklin O-335-6 engine, 35 built. [11] [12]
Hiller HT Mk 1
Royal Navy designation for 20 former U.S. Navy HTE-2s. [13]
Hiller HT Mk 2
UH-12Es for Royal Navy. 21 supplied. [13]
CH-112 Nomad
Canadian military designation for the UH-12Es.

Civilian

Hiller UH-12A (Hiller 360) in 1955 when used as a crop spraying demonstrator in England Hiller UH-12A G-ANOC Fison-Awk RWY 09.07.55 edited-2.jpg
Hiller UH-12A (Hiller 360) in 1955 when used as a crop spraying demonstrator in England
A civilian UH-12 at Heli UK Expo, 2014 G-ASAZ (14389405782).jpg
A civilian UH-12 at Heli UK Expo, 2014
UH-12A
Original production model for the U.S. Army, powered by a six cylinder fan-cooled Franklin 6V4-178-B33 engine with a maximal power of 178hp at 3000 rpm. The main rotor blades (produced by the Parsons Industries Inc.) are of solid wood laminations. The body of the blade is in fact essentially made up of numerous strip and block wooden laminations designed to provide a strong but highly flexible blade. The entire blade surface is covered with fiberglass cloth with the leading edge covered with an additional stainless steel sheet. The tail rotor is of all metal construction.
UH-12B (HTE-2)
Training version for the U.S. Navy. U.S. Navy designation HTE-2 prior to 1962.
UH-12C
Three-seat version, equipped with wood rotor blades and one-piece 'goldfish bowl' canopy. U.S. Army designation H-23C.
UH-12D
Improved version of the H-23C for the U.S. Army. U.S. Army designation H-23D.
UH-12E
Three-seat dual-control version of the H-23D.
UH-12ET
Turbine-powered version of the UH-12E, fitted with an Allison 250 turboshaft engine.
UH-12E-3
New three-seat production version.
UH-12E-3T
New turbine-powered production version.
Hiller UH-12E-4, four seater Hiller SE-HHU.jpg
Hiller UH-12E-4, four seater
UH-12E-4
Four-seat civilian version (pilot in front, with back seat for three passengers). United States Army designation H-23F. VO-540 powered. Conversion kit available for E-12 models. [14]
UH-12E-4T
Four-seat turbine-powered production version.
UH-12L-4
Lengthened version with wider cabin windows.

Operators

Flag of Argentina.svg  Argentina
Bandera de Bolivia (Estado).svg  Bolivia
Flag of Canada (Pantone).svg  Canada
Flag of Chile.svg  Chile
Flag of Colombia.svg  Colombia
Flag of the Dominican Republic.svg  Dominican Republic
Flag of France.svg  France
Flag of Germany.svg  West Germany
Flag of Guatemala.svg  Guatemala
Flag of Indonesia.svg  Indonesia
Flag of Israel.svg  Israel
Israeli Air Force H-23A (model UH-12A), Jerusalem 1952 Hiller OH23 IDF Air Force1952.jpg
Israeli Air Force H-23A (model UH-12A), Jerusalem 1952
Flag of Mexico.svg  Mexico
Flag of the Netherlands.svg  Netherlands
Flag of Paraguay.svg  Paraguay
Flag of Peru.svg  Peru
Flag of South Korea.svg  South Korea
UH-12B at the Swiss Air Force Museum Dubendorf KAB-202 Hiller UH-12B at Swiss Air Force Museum Dubendorf (Ank Kumar) 02.jpg
UH-12B at the Swiss Air Force Museum Dübendorf

Flag of Switzerland (Pantone).svg   Switzerland

Flag of Thailand.svg  Thailand
Flag of the United Kingdom.svg  United Kingdom
Flag of the United States (23px).png  United States
Flag of Uruguay.svg  Uruguay

Specifications (H-23D)

3-view line drawing of the Hiller H-23 Raven Hiller H-23 Raven 3-view line drawing.png
3-view line drawing of the Hiller H-23 Raven

Data from United States Military Aircraft since 1909 [34]

General characteristics

Performance

See also

Related development

Aircraft of comparable role, configuration, and era

Related lists

Related Research Articles

<span class="mw-page-title-main">Kamov Ka-25</span> Type of aircraft

The Kamov Ka-25 is a naval helicopter, developed for the Soviet Navy in the USSR from 1958.

<span class="mw-page-title-main">Bell OH-58 Kiowa</span> 1967 scout helicopter series by Bell Helicopter

The Bell OH-58 Kiowa is a family of single-engine single-rotor military helicopters used for observation, utility, and direct fire support. It was produced by the American manufacturer Bell Helicopter and is closely related to the Model 206A JetRanger civilian helicopter.

<span class="mw-page-title-main">Bell UH-1 Iroquois</span> Family of American military utility helicopters

The Bell UH-1 Iroquois is a utility military helicopter designed and produced by the American aerospace company Bell Helicopter. It is the first member of the prolific Huey family, as well as the first turbine-powered helicopter in service with the United States military.

<span class="mw-page-title-main">Bell AH-1 SuperCobra</span> Series of twin-engine attack helicopters

The Bell AH-1 SuperCobra is a twin-engined attack helicopter that was developed on behalf of, and primarily operated by, the United States Marine Corps (USMC). The twin Cobra family, itself part of the larger Huey family, includes the AH-1J SeaCobra, the AH-1T Improved SeaCobra, and the AH-1W SuperCobra.

<span class="mw-page-title-main">Sikorsky H-19 Chickasaw</span> Family of utility helicopters

The Sikorsky H-19 Chickasaw is a multi-purpose piston engined helicopter that was used by the United States Army and United States Air Force. It was also license-built by Westland Aircraft as the Westland Whirlwind in the United Kingdom. United States Navy and United States Coast Guard models were designated HO4S, while those of the U.S. Marine Corps were designated HRS. In 1962, the U.S. Navy, U.S. Coast Guard and U.S. Marine Corps versions were all redesignated as H-19s like their U.S. Army and U.S. Air Force counterparts.

<span class="mw-page-title-main">Hughes OH-6 Cayuse</span> 1963 scout helicopter

The Hughes OH-6 Cayuse is a single-engine light helicopter designed and produced by the American aerospace company Hughes Helicopters. Its formal name is derived from the Cayuse people, while its "Loach" nickname is derived from Light Observation Helicopter (LOH) program under which it was procured, and likely the word "chopper", a common nickname for helicopters.

<span class="mw-page-title-main">Bell 206</span> Utility helicopter family by Bell

The Bell 206 is a family of two-bladed, single- and twin-engined helicopters, manufactured by Bell Helicopter at its Mirabel, Quebec, plant. Originally developed as the Bell YOH-4 for the United States Army's Light Observation Helicopter program, it was not selected by the Army. Bell redesigned the airframe and successfully marketed the aircraft commercially as the five-place Bell 206A JetRanger. The new design was eventually selected by the Army as the OH-58 Kiowa.

<span class="mw-page-title-main">Robinson R44</span> Family of American light helicopters

The Robinson R44 is a four-seat light helicopter produced by Robinson Helicopter Company since 1992. Derived from the company's two-seat Robinson R22, the R44 features hydraulically assisted flight controls and a larger engine. It was first flown on 31 March 1990 and received FAA certification in December 1992, with the first delivery in February 1993.

<span class="mw-page-title-main">Mil Mi-4</span> Soviet transport helicopter

The Mil Mi-4 is a Soviet transport helicopter that served in both military and civilian roles.

<span class="mw-page-title-main">Piasecki H-21</span> American military transport helicopter family

The Piasecki H-21 Workhorse/Shawnee is an American helicopter, the fourth of a line of tandem rotor helicopters designed and built by Piasecki Helicopter. Commonly called "the flying banana", it was a multi-mission helicopter, capable of being fitted with wheels, skis or floats.

<span class="mw-page-title-main">Sikorsky H-34</span> American helicopter

The Sikorsky H-34 "Choctaw" is an American piston-engined military helicopter originally designed by Sikorsky as an anti-submarine warfare (ASW) aircraft for the United States Navy. It has seen extended use when adapted to turbine power by the British licensee as the Westland Wessex and Sikorsky as the later S-58T.

<span class="mw-page-title-main">MD Helicopters MH-6 Little Bird</span> Attack helicopter used in United States special operations

The Boeing MH-6M Little Bird and its attack variant, the AH-6, are light helicopters used for special operations in the United States Army. Originally based on a modified OH-6A, it was later based on the MD 500E, with a single five-bladed main rotor. The newest version, the MH-6M, is based on the MD 530F and has a single, six-bladed main rotor and four-bladed tail rotor.

<span class="mw-page-title-main">Kaman HH-43 Huskie</span> Helicopter with intermeshing rotors in use by the US military from the 1950s to the 1970s

The Kaman HH-43 Huskie is a helicopter developed and produced by the American rotorcraft manufacturer Kaman Aircraft. It is perhaps most distinctive for its use of twin intermeshing rotors, having been largely designed by the German aeronautical engineer Anton Flettner.

<span class="mw-page-title-main">Schweizer S300</span> Helicopter model

The Schweizer S300 series family of light utility helicopters was originally produced by Hughes Helicopters, as a development of the Hughes 269. Later manufactured by Schweizer Aircraft, and currently produced by Schweizer RSG, the basic design has been in production for over 50 years. The single, three-bladed main rotor and piston-powered S300 is mostly used as a cost-effective platform for training and agriculture.

<span class="mw-page-title-main">Hughes TH-55 Osage</span> Piston-powered light training helicopter produced for the United States Army

The Hughes TH-55 Osage is a piston-powered light training helicopter produced for the United States Army. It was also produced as the Model 269 family of light utility helicopters, some of which were marketed as the Model 300. The Model 300C was produced and further developed by Schweizer after 1983.

<span class="mw-page-title-main">Eurocopter UH-72 Lakota</span> Light utility multipurpose helicopter

The EurocopterUH-72 Lakota is a twin-engine helicopter with a single, four-bladed main rotor. The UH-72 is a militarized version of the Eurocopter EC145, built by American Eurocopter, a division of Airbus Group, Inc. Several hundred UH-72 of various types have entered service by the 2020s since their introduction in 2006.

<span class="mw-page-title-main">Fairchild Hiller FH-1100</span> Type of aircraft

The Fairchild Hiller FH-1100 is a single-engine turbine, single two-bladed rotor, light helicopter that was designed and produced by the American aircraft manufacturer Fairchild Hiller in the 1960s.

<span class="mw-page-title-main">Bell UH-1 Iroquois variants</span> Variants of the American military utility helicopter

The Bell UH-1 Iroquois military helicopter, first introduced in 1959, is the first production member of the prolific Huey family of helicopters, and was itself developed in over twenty variants, which are listed below.

<span class="mw-page-title-main">Bell 47J Ranger</span> Type of aircraft

The Bell 47J Ranger is an American single-engine single-rotor light helicopter manufactured by Bell Helicopter. It was an executive variant of the highly successful Bell 47 and was the first helicopter to carry a United States president.

<span class="mw-page-title-main">Bell H-13 Sioux</span> Single-engine single-rotor light military helicopter

The Bell H-13 Sioux is an American single-engine light helicopter built by Bell Helicopter and manufactured by Westland Aircraft under license for the British military as the Sioux AH.1 and HT.2.

References

  1. Donald, David. The Complete Encyclopedia of World Aircraft. New York: Barnes & Noble Books, 1998.[ page needed ]
  2. "Hiller 360 / UH-12 / OH-23 helicopter - development history, photos, technical data". www.aviastar.org. Retrieved 2024-05-14.
  3. Bazzani, Mario. "Hiller UH-12B". www.heli-archive.ch. Retrieved 2024-05-14.
  4. "Hiller 360 / UH-12 / OH-23 helicopter - development history, photos, technical data". www.aviastar.org. Retrieved 2024-03-14.
  5. Bridgman 1953, pp. 240–241.
  6. Angers, Trent (2014). The Forgotten Hero of My Lai: The Hugh Thompson Story (Rev ed.). Acadian House. pp. 69–66. ISBN   978-0925417909.
  7. Bolger, Daniel (1991). Scenes from an Unfinished War: Low intensity conflict in Korea 1966–1969 (PDF). Diane Publishing Co. pp. 107–9. ISBN   978-0788112089. Archived (PDF) from the original on 7 September 2021.PD-icon.svg This article incorporates text from this source, which is in the public domain .
  8. Harding 1990, p.141.
  9. 1 2 3 4 5 6 Harding 1990, p.142.
  10. Swanborough and Bowers 1963, p.274.
  11. 1 2 Swanborough and Bowers 1976, p.440.
  12. "Hiller HTE-2 'Raven'". Aero-web.org. Retrieved 15 November 2009.
  13. 1 2 Thetford 1978, p.400.
  14. A.C. Bass (November 1960). "E-4 "Station Wagon"". Flying Magazine.
  15. "World Air Forces 1987 pg. 40". flightglobal.com. Retrieved 23 March 2013.
  16. "Policia de la Provincia de Buenos Aires UH-12E" . Retrieved 23 March 2013.
  17. "CH-112 Nomad". canadianwings.com. Retrieved 23 March 2013.
  18. 1 2 "World Helicopter Market 1968 pg. 50". bell47.net. Retrieved 2013-03-23.
  19. "World Helicopter Market 1968 pg. 51". flightglobal.com. Retrieved 23 March 2013.
  20. Vesser 2005, p. 20
  21. 1 2 3 "World Helicopter Market 1968 pg. 52". bell47.net. Retrieved 2013-03-23.
  22. "World Helicopter Market 1968 pg. 53". flightglobal.com. Retrieved 23 March 2013.
  23. "Koninklijke Luchtmacht UH-12E" . Retrieved 23 March 2013.
  24. "World Air Forces 1987 pg. 77". flightglobal.com. Retrieved 23 March 2013.
  25. "World Helicopter Market 1968 pg. 54". flightglobal.com. Retrieved 23 March 2013.
  26. "US→South Korea (1966-1967)". armstrade.sipri.org. Retrieved 23 March 2013.
  27. "South Korean Army OH-23". Demand media. Retrieved 23 March 2013.
  28. Bazzani, Mario. "Hiller UH-12B". www.heli-archive.ch. Retrieved 2024-05-14.
  29. 1 2 "World Helicopter Market 1968 pg. 55". bell47.net. Retrieved 2013-03-23.
  30. "Royal Navy Fleet Air Arm UH-12B HTE-2" . Retrieved 23 March 2013.
  31. "World Helicopter Market 1968 pg. 59". flightglobal.com. Retrieved 23 March 2013.
  32. 1 2 "The H-23 Raven Helicopter". bell47.net. Retrieved 2013-03-26.
  33. "World Air Forces 1975 pg. 314". flightglobal.com. Retrieved 23 March 2013.
  34. Swanborough and Bowers 1963, p.276.
  35. 1 2 Harding 1990, p.143.
  36. Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.

Bibliography