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Bell UH-1 Iroquois The Bell UH-1 Iroquois (nicknamed "Huey") 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 helic ...
military helicopter, first introduced in 1959, is the first production member of the prolific
Huey family The Bell Huey family of helicopters includes a wide range of civil and military aircraft produced since 1956 by Bell Helicopter. This H-1 family of aircraft includes the utility UH-1 Iroquois and the derivative AH-1 Cobra attack helicopter series ...
of helicopters, and was itself developed in over twenty variants, which are listed below.


XH-40 and YH-40

The first Bell helicopter to use a turbine engine was a modified Model 47 (designated XH-13F), which had its initial flight in October 1954. The U.S. Army began a competition for a new helicopter for general utility and medical/casualty evacuation in 1955. In June 1955, Bell Helicopter was awarded a contract to develop the next generation turbine-powered
utility helicopter A utility helicopter is a multi-purpose helicopter capable of fulfilling many different roles. Civil Many civilian helicopters are made for utility work such as agricultural aircraft. Many police and fire departments maintain and operate utili ...
for the U.S. Army. The resulting Bell Model 204 was designated XH-40 by the U.S. military and first flew on 22 October 1956. Two more prototypes were built in 1957, and six YH-40 pre-production helicopters were delivered in 1958.Donald, David, ed. "Bell 204". "Bell 205". ''The Complete Encyclopedia of World Aircraft''. Barnes & Nobel Books, 1997. . The YH-40's cabin was lengthened by , and had more ground clearance compared to the XH-40. Bell believed the YH-40 was ideal for troop transport and cargo carrying as well as the medevac role, a view soon adopted by the Army; they found the pre-production aircraft so much better in service than previous piston-powered helicopters that they soon ordered more.


UH-1A

The HU-1A (later redesignated the UH-1A) was the first turbine-equipped U.S. helicopter to go into production, and production models first entered service with the
101st Airborne Division The 101st Airborne Division (Air Assault) ("Screaming Eagles") is a light infantry division of the United States Army that specializes in air assault operations. It can plan, coordinate, and execute multiple battalion-size air assault operati ...
at
Fort Campbell, Kentucky Fort Campbell is a United States Army installation located astride the Kentucky–Tennessee border between Hopkinsville, Kentucky and Clarksville, Tennessee (post address is located in Kentucky). Fort Campbell is home to the 101st Airborne Divi ...
, the
82nd Airborne Division The 82nd Airborne Division is an Airborne forces, airborne infantry division (military), division of the United States Army specializing in Paratrooper, parachute assault operations into denied areasSof, Eric"82nd Airborne Division" ''Spec Ops ...
and the
57th Medical Detachment The 57th Medical Detachment (Helicopter Ambulance) was a US Army unit located at Fort Bragg, North Carolina, which provided aeromedical evacuation support to the Fort Bragg community, while training in its combat support mission. The first heli ...
. Although they were intended for evaluation only, the Army quickly pressed them into operational service and Hueys with the 57th Medical Detachment arrived in Vietnam in March 1962.Mutza 1986 The helicopter was originally designated the HU-1A, which is where it received its nickname - "Huey." The official U.S. Army designation Iroquois (Army helicopters are traditionally given Native American names) was almost never used in practice.Drendel 1983, pp. 9–21. Fourteen of the original order of UH-1As were designated as TH-1A which were used for crew training and a single aircraft was redesignated XH-1A for grenade launcher testing in 1960. The first UH-1As to arrive in Vietnam after the 57th Medical Detachment were with a new test unit, the US Army's Utility Tactical Transport Company (UTTCO). UTTCO had 20 "Alpha" Hueys and deployed to Vietnam in the fall of 1962. These aircraft were used as armed escorts to the existing
H-21 Shawnee 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 (later Boeing Vertol). Commonly called "the flying banana", it was a multi-mission helicop ...
s and
H-34 Choctaw The Sikorsky H-34 "Choctaw" (company designation S-58) 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 ad ...
s troop carriers. In use the UH-1A proved under-powered with their Lycoming T53-L-1 powerplants of just 860 shp and indicated the need for improved follow-on models of the Huey.


UH-1B

The HU-1B was an improved model that was equipped with the Lycoming T53-L-5 engine of , revised main rotor blades of diameter and chord, 13 inch higher rotor mast and a longer cabin that could accommodate seven passengers. This version was redesignated UH-1B in 1962. Later production UH-1Bs were equipped with Lycoming T53-L-9 and L-11 engines of . Gross weight was and the standard empty weight was . Army testing of the "B" model started in November 1960 with first production aircraft arriving in March 1961. A total of 1010 "Bravo" models were delivered to the US Army. First deployment was in November 1963 when eleven were sent to Vietnam to join the "Alpha" models already in use by UTTCO. One NUH-1B was produced for test purposes. Bell certified a civil version of the UH-1B incorporating some minor safety improvements, such as improved door locks. The aircraft was marketed as the
Bell 204B The Bell 204 and 205 are the civilian versions of the UH-1 Iroquois single-engine military helicopter of the Huey family of helicopters. They are type-certificated in the transport category and are used in a wide variety of applications, in ...
. Later on as the "long cabin" Hueys supplanted the Bravo in the transport role, the UH-1B became increasingly used in a "gunship" role equipped with machine guns and rockets. However, it had insufficient power to maintain full capability when used with the heaviest armament subsystems, leading to the UH-1C.


UH-1C

The UH-1C was specifically developed as a gunship version until the "interim" attack helicopter, the Bell AH-1G Huey Cobra was available and to correct the deficiencies of the UH-1B when it was used in the armed role. The UH-1C was widely referred to as the "Huey Hog" in US Army service. The "Charlie" model was fitted with the T53-L-9 or L-11 engine to provide the power needed to lift the weapons systems in use or under development at the time. It incorporated the new Bell 540 rotor system with chord blades. The increased power lead Bell's engineers to design a new tailboom for the "C" which incorporated a wider chord fin on a longer boom and larger synchronized elevators. The "C" also introduced a dual hydraulic control system for redundancy in battle and an improved inlet filter system for the dusty conditions found in southeast Asia. Fuel was increased to 242
US gallon The gallon is a unit of volume in imperial units and United States customary units. Three different versions are in current use: *the imperial gallon (imp gal), defined as , which is or was used in the United Kingdom, Ireland, Canada, Austral ...
s and gross weight to , giving a nominal useful load of . Development on the "C" model had commenced in 1960, with production starting in June 1966. A total of 766 "C" models were completed, including five for the
Royal Australian Navy The Royal Australian Navy (RAN) is the principal naval force of the Australian Defence Force (ADF). The professional head of the RAN is Chief of Navy (CN) Vice Admiral Mark Hammond AM, RAN. CN is also jointly responsible to the Minister of ...
and five for Norway. The balance went to the US Army. Many UH-1Cs were later re-engined with the Lycoming T53-L-13 powerplant. With this engine they were redesignated UH-1M.


UH-1D

The earlier "short-body" Hueys were a success, especially in the gunship role, but lacked the cabin space to be an effective troop transport. The US Army wanted a version that could carry a crew of four (two pilots and two door gunners) and also deliver an infantry section of eight to ten soldiers. Bell's solution was to stretch the UH-1B fuselage by 41 inches (105 cm) and use the extra space to fit two sideways-facing seats on either side of the transmission. This brought the total
seating capacity Seating capacity is the number of people who can be seated in a specific space, in terms of both the physical space available, and limitations set by law. Seating capacity can be used in the description of anything ranging from an automobile that ...
to 15, including crew seats. The new Huey was designated UH-1D by the US Army and as the Model 205 by Bell. The enlarged cabin could also accommodate six stretchers, double that of the earlier models, making the "Delta" a good
MEDEVAC Medical evacuation, often shortened to medevac or medivac, is the timely and efficient movement and en route care provided by medical personnel to wounded being evacuated from a battlefield, to injured patients being evacuated from the scene of a ...
aircraft. In place of the earlier model's sliding side doors with a single window, larger doors were fitted which had two windows, plus a small "hinged panel" with an optional window, providing access to the cabin. The doors and hinged panels were quickly removable and the Huey could be flown in that configuration. The first YUH-1D prototype flew in August 1960. Seven YUH-1Ds were delivered and tested at
Edwards AFB Edwards Air Force Base (AFB) is a United States Air Force installation in California. Most of the base sits in Kern County, but its eastern end is in San Bernardino County and a southern arm is in Los Angeles County. The hub of the base is Ed ...
starting in March 1961. The YUH-1D was initially equipped with a main rotor and a Lycoming T53-L-9 engine. Testing revealed that more power was required and so the rotor was lengthened to with a chord of and the engine was upgraded to the Lycoming T53-L-11 engine of . A longer tailboom was designed to accommodate the longer rotor blades. Gross weight was . Later production "Deltas" had the Lycoming T53-L-13 powerplant of installed and redesignated as "Hotel" models. The first Army unit deliveries of the "Delta" model were on 9 August 1963 when the 11th Air Assault Division (Test) at
Fort Benning Fort Benning is a United States Army post near Columbus, Georgia, adjacent to the Alabama–Georgia border. Fort Benning supports more than 120,000 active-duty military, family members, reserve component soldiers, retirees and civilian employees ...
Georgia received two. This unit was renamed the 1st Cavalry Division and deployed to Vietnam with its "Delta" Hueys. A total of 2,008 UH-1Ds were delivered to the US Army between 1962 and 1966. The model was widely exported and served with the armed forces of
Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
and
South Vietnam South Vietnam, officially the Republic of Vietnam ( vi, Việt Nam Cộng hòa), was a state in Southeast Asia that existed from 1955 to 1975, the period when the southern portion of Vietnam was a member of the Western Bloc during part of th ...
among others. A grand total of 2,561 UH-1Ds were built, including 352 constructed by Dornier for the
West German West Germany is the colloquial term used to indicate the Federal Republic of Germany (FRG; german: Bundesrepublik Deutschland , BRD) between its formation on 23 May 1949 and the German reunification through the accession of East Germany on 3 O ...
armed forces. The HH-1D was a base rescue/fire-fighting version for the US Army that had a 50-gallon water and foam spray system that could be discharged via an extendable boom. Upgrading the UH-1D to the Lycoming T53-L-13 engine, plus relocating the
pitot tube A pitot ( ) tube (pitot probe) measures fluid flow velocity. It was invented by a French engineer, Henri Pitot, in the early 18th century, and was modified to its modern form in the mid-19th century by a French scientist, Henry Darcy. It is ...
from the nose to the roof resulted in a new model, the UH-1H, which was to become the most produced variant of the Huey family.


UH-1E

In 1962 the
US Marines The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through combi ...
held a competition to choose a new assault support helicopter to replace the
Cessna O-1 The Cessna L-19/O-1 Bird Dog is a liaison and observation aircraft. It was the first all-metal fixed-wing aircraft ordered for and by the United States Army following the Army Air Forces' separation from it in 1947. The Bird Dog had a lengthy ...
and Kaman OH-43D helicopter. The winner was the UH-1B which was already then in service with the US Army. The UH-1B was developed into a special model, designated UH-1E, to meet Marine Corps requirements. The major changes included the use of all-aluminum construction for corrosion resistance (earlier UH-1s had some magnesium components), special avionics that were compatible with Marine Corps ground frequencies, a rotor brake to stop the rotor quickly on shutdown for shipboard use and a roof-mounted rescue hoist. The UH-1E was first flown on 7 October 1963 and deliveries commenced 21 February 1964, with 192 aircraft completed. Due to production line realities at Bell the UH-1E was produced in two different versions, both with the same UH-1E designation. The first 34 built were essentially UH-1B airframes with the Lycoming T53-L-11 of . Because Bell was switching Army production to the UH-1C the UH-1E production line was converted to commonality with the “C”. This meant the later “Echo” Hueys were completed with the “Charlie” style tailboom including the larger fin, the 540 rotor system and a gross weight of . The Marines used the UH-1E as both a gunship and troop transport. Many were upgraded to the Lycoming T53-L-13 engine which produced , making these “Echos” similar to the Army “Mike” models. At least 126 UH-1Es survived their Vietnam service and were still in use more than a decade later. There was a Marine Corps training version of the UH-1E, which was based on the UH-1C variant and was designated TH-1E. Twenty were delivered in 1965.


UH-1F

Bell Helicopters was the winner of a 1963
United States Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Signal ...
competition for a support helicopter for use on its missile bases. Bell had proposed the UH-1B for the competition but the USAF asked Bell to develop a special version of the "Bravo" in using the
General Electric T58 The General Electric T58 is an American turboshaft engine developed for helicopter use. First run in 1955, it remained in production until 1984, by which time some 6,300 units had been built. On July 1, 1959, it became the first turbine engine t ...
turboshaft A turboshaft engine is a form of gas turbine that is optimized to produce shaftpower rather than jet thrust. In concept, turboshaft engines are very similar to turbojets, with additional turbine expansion to extract heat energy from the exhaust ...
as a powerplant. The USAF already had a large inventory of these engines for its fleet of Sikorsky HH-3 Jolly Green Giant rescue helicopters and wanted to have commonality between the types. This engine was capable of 1,250 hp (932 kW) compared to the UH-1B's 1,100 hp (820 kW) T53-L11. In response Bell proposed an upgraded version of the UH-1B with the T58 engine installed. The resulting UH-1F had the shorter cabin of the "Bravo" Huey, but with the longer tail boom, rotor and transmission of the UH-1D. Due to the Huey's configuration, Bell installed the T58 engine backwards compared to the HH-3. The Huey's engine is behind the transmission, whereas the HH-3's engines are in front of the transmission. Externally, the only visible differences from UH-1B were the engine exhaust, which exited to the right side of the engine and the longer tail boom. The UH-1F was introduced into the USAF inventory on 20 February 1964. The USAF took delivery of 119 with production ending in 1967. Many of the aircraft served in southeast Asia with the 20th Special Operations Squadron and some were converted to the armed UH-1P configuration. In Italy, Agusta produced a similar model by re-engining the 204B with the 1,225 hp (914 kW)
Rolls-Royce Gnome The Rolls-Royce Gnome is a British turboshaft engine originally developed by the de Havilland Engine Company as a licence-built General Electric T58, an American mid-1950s design. The Gnome came to Rolls-Royce after their takeover of Bristol S ...
(license-built T58) turboshaft, but later models used T58s. The AB204B was exported to the military of the Netherlands, Sweden, Austria, and Switzerland. It had a rescue hoist located at the right side of the cabin. The last UH-1F was retired from the USAF in the early 1980s when it was replaced by the
UH-1N The Bell UH-1N Twin Huey is a medium military helicopter designed and produced by the American aerospace manufacturer Bell Helicopter. It is a member of the extensive Huey family, the initial version was the CUH-1N Twin Huey (later CH-135 Twin ...
. many of these aircraft later served as forest fire fighting aircraft with various US state governments and agencies. There was a TH-1F trainer also built for the USAF. The first TH-1F was flown in January 1967 and deliveries ran from April to July of that year with 27 completed. Examples of this variant were operated by the USAF Instrument Flight Center.


UH-1H

The UH-1H was an improved UH-1D, with the Lycoming T53-L-13 engine of installed, plus the
pitot tube A pitot ( ) tube (pitot probe) measures fluid flow velocity. It was invented by a French engineer, Henri Pitot, in the early 18th century, and was modified to its modern form in the mid-19th century by a French scientist, Henry Darcy. It is ...
relocated from the nose to the roof, to reduce ground damage to it. "Hotel" models were created by upgrading "Deltas" with the more powerful engine. The first YUH-1H flew in 1966 with deliveries of production models starting in September 1967. The "Hotel" model Huey was produced in larger numbers than any other model, with 4,850 delivered to the US Army alone. The "Hotel" model was widely exported and was also built under license in
Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...
,
Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical re ...
,
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
and
Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia, at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the nort ...
. Ten were sold to Canada for use under the designation CUH-1H with the first one delivered on 6 March 1968. These were evaluated by the
Canadian Forces } The Canadian Armed Forces (CAF; french: Forces armées canadiennes, ''FAC'') are the unified military forces of Canada, including sea, land, and air elements referred to as the Royal Canadian Navy, Canadian Army, and Royal Canadian Air Force. ...
and found unsuitable for Canadian tactical use, which resulted in the Canadian government sponsoring the development of the twin-engined version of the "Hotel", the
UH-1N Twin Huey The Bell UH-1N Twin Huey is a medium military helicopter designed and produced by the American aerospace manufacturer Bell Helicopter. It is a member of the extensive Huey family, the initial version was the CUH-1N Twin Huey (later CH-135 Twi ...
. The ten CUH-1Hs were re-equipped for
search and rescue Search and rescue (SAR) is the search for and provision of aid to people who are in distress or imminent danger. The general field of search and rescue includes many specialty sub-fields, typically determined by the type of terrain the search ...
use, redesignated CH-118 and served until 1995. Bell developed a certified version of the UH-1H for the civil market. The aircraft incorporated minor changes for safety, such as dual sliding door locks and a baggage compartment in the tailboom. It was marketed by Bell as the Model 205A and later the improved 205A-1. The "Hotel" model Huey was also the basis for a number of sub-variants: * HH-1H was a UH-1H equipped for base rescue duties. Thirty were delivered to the
USAF The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...
between 1970 and 1973. *EH-1H was a UH-1H modified under Project Quick Fix in 1976 and used as communications jamming aircraft with the US Army. Twenty-two aircraft were modified to this configuration beginning in 1976. Initial aircraft were fielded to the
82nd Airborne Division The 82nd Airborne Division is an Airborne forces, airborne infantry division (military), division of the United States Army specializing in Paratrooper, parachute assault operations into denied areasSof, Eric"82nd Airborne Division" ''Spec Ops ...
and the 2nd Armored Division. The 82nd fielded the type during the invasion of Grenada (Operation Urgent Fury) in 1983. * UH-1J an improved Japanese version of the UH-1H built under license in Japan by
Fuji Heavy Industries is a Japanese multinational corporation and conglomerate primarily involved in both terrestrial and aerospace transportation manufacturing. It is best known for its line of Subaru automobiles. Founded in 1953, the company was formerly named ( ...
. It was locally designated as the UH-1J.UH-1J 多用途ヘリコプター.
Retrieved: 11 December 2007.
*EH-1X was an improved EH-1H communications jammer and DF aircraft. *JUH-1 was a UH-1H equipped with retractable skid gear and an AN/APS 94 radar boom mounted on the belly. *UH-1V was a
MEDEVAC Medical evacuation, often shortened to medevac or medivac, is the timely and efficient movement and en route care provided by medical personnel to wounded being evacuated from a battlefield, to injured patients being evacuated from the scene of a ...
version of the "Hotel", with upgraded avionics. *TH-1H: Modified UH-1Hs for use as basic helicopter flight trainers by the USAF. A UAV version of UH-1H is being developed by
Aurora Flight Sciences Aurora Flight Sciences is an American aviation and aeronautics research subsidiary of Boeing which primarily specializes in the design and construction of special-purpose Unmanned aerial vehicles. Aurora has been established for 20+ years and th ...
using the ''Tactical Autonomous Aerial Logistics System'' platform for the Autonomous Aerial Cargo Utility System (AACUS) program. The Bell Huey II is a re-manufactured, modified and re-engined military UH-1H, including an Allison T53-L-703 turboshaft engine of 1,800 shp (1,343 kW), a vibration-reduction system, infrared countermeasures and a night-vision-goggle (NVG) compatible cockpit. Currently offered by Bell.


UH-1J

Some UH-1Hs built by Fuji in Japan for the
Japan Ground Self-Defense Force The Japan Ground Self-Defense Force ( ja, 陸上自衛隊, Rikujō Jieitai), , also referred to as the Japanese Army, is the land warfare branch of the Japan Self-Defense Forces. Created on July 1, 1954, it is the largest of the three service b ...
were improved and given the local designation of UH-1J, although this was not used in the US designation series. It has an upgraded engine and a
UH-1N The Bell UH-1N Twin Huey is a medium military helicopter designed and produced by the American aerospace manufacturer Bell Helicopter. It is a member of the extensive Huey family, the initial version was the CUH-1N Twin Huey (later CH-135 Twin ...
nose. Japan's UH-1H and UH-1Js will be replaced by a military version of the
Bell 412 The Bell 412 is a utility helicopter of the Huey family manufactured by Bell Helicopter. It is a development of the Bell 212, with the major difference being the composite four-blade main rotor. Design and development Development began in the ...
.UH-X Multipurpose Helicopter
''Global Security'' Retrieved February 22, 2017


HH-1K

Bell was awarded a contract by the
US Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage of ...
in December 1968 for a new search and rescue helicopter. The aircraft was designated the HH-1K and was basically a UH-1E with different avionics and the Lycoming T53-L-13 powerplant of . Deliveries of the “Kilo” Huey started in May 1970 and by November of that year three had been sent to Vietnam to serve with US Navy squadron HA(L)-3 and, later with the HA(L)-4 Red Wolves and the HA(L)-5 Blue Hawks. A total of 27 HH-1Ks were produced.


UH-1L

With deliveries of the UH-1E underway to the
US Marines The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through combi ...
the
US Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage of ...
tested a few and found that the type would suit their uses as a utility helicopter. On 16 May 1968, the US Navy ordered eight aircraft under the designation UH-1L. The “Lima” Huey was basically a UH-1E, of the later production type based on the Army's UH-1C, equipped with a rescue hoist and intake particle screen. The “Ls” were delivered without the armour or armament installed and were equipped with the Lycoming T53-L-13 powerplant of . The first four “Limas” were delivered in November 1969 and sent to Vietnam to equip the US Navy HA(L)-3 detachment assigned to Operation Sealords. In Vietnam the aircraft were modified with weapons and armour and were fitted to carry bombs and
Fuel-Air Explosive A thermobaric weapon, also called an aerosol bomb, a vacuum bomb or a fuel air explosive (FAE), is a type of explosive that uses oxygen from the surrounding air to generate a high-temperature explosion. The fuel–air explosive is one of the be ...
munitions. There was a TH-1L version of the UH-1L for the Navy to replace the H-34 and the borrowed Army UH-1Ds used in the training role, including for pilot aircraft carrier qualification training. Forty-five TH-1Ls were delivered starting in November 1969.


UH-1M

The "Mike" model Huey was a conversion of the existing UH-1C by re-engining it with the Lycoming T53-L-13 powerplant used in the UH-1H. This provided more power to the "C" model for its role as a gunship and also provided engine commonality between the attack and transport helicopters in use in Vietnam at that time.


UH-1N

Bell flew the first twin-engined Huey in April 1965, calling it the Model 208. It was powered by a Continental XT67 twin-pack engine module. The Canadian government provided the incentive for Bell to continue development of the Twin Huey using
Pratt & Whitney Canada PT6T The Pratt & Whitney Canada PT6T Twin-Pac is a turboshaft engine designed for helicopters. Manufactured by Pratt & Whitney Canada, its first application was in the Bell 212 and UH-1N Twin Huey helicopter family. The PT6T Twin-Pac consists of two ...
twin-pack engine. The project attracted orders from the
Canadian Forces } The Canadian Armed Forces (CAF; french: Forces armées canadiennes, ''FAC'') are the unified military forces of Canada, including sea, land, and air elements referred to as the Royal Canadian Navy, Canadian Army, and Royal Canadian Air Force. ...
,
US Marine Corps The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through combi ...
,
US Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage of ...
and
USAF The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...
, but not the US Army. The new aircraft was designated UH-1N Iroquois in US service and CUH-1N Twin Huey in Canadian Forces use. The Canadian designation was later changed to CH-135 Twin Huey. There was an HH-1N version produced for the USAF as a base rescue helicopter and for use by the 20th Special Operations Squadron in the counter-insurgency role using the call sign ''Green Hornet''. Some Marine Corps UH-1Ns were converted to VH-1Ns as VIP transports, including six for presidential use. The UH-1N was widely produced and exported to a large number of countries and license-built by
Agusta Agusta was an Italian helicopter manufacturer. It was based in Samarate, Northern Italy. The company was founded by Count Giovanni Agusta in 1923, who flew his first airplane in 1907. The MV Agusta motorcycle manufacturer began as an offshoot o ...
in
Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical re ...
. Bell certified a civil version as the Model 212 in October 1970.


UH-1P

An unknown number of UH-1Fs were modified to UH-1P configuration by the
USAF The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...
for use by their 20th Special Operations Squadron, The Green Hornets, based in southeast Asia during the Vietnam War. Official USAF sources state that these aircraft were used for a classified
psychological warfare Psychological warfare (PSYWAR), or the basic aspects of modern psychological operations (PsyOp), have been known by many other names or terms, including Military Information Support Operations (MISO), Psy Ops, political warfare, "Hearts and Mi ...
role, but this is incorrect. The "Papa" Hueys were in fact modified and employed as gunships armed with
machine gun A machine gun is a fully automatic, rifled autoloading firearm designed for sustained direct fire with rifle cartridges. Other automatic firearms such as automatic shotguns and automatic rifles (including assault rifles and battle rifles) a ...
s and
rocket launchers A rocket launcher is a weapon that launches an unguided, rocket-propelled projectile. History The earliest rocket launchers documented in imperial China consisted of arrows modified by the attachment of a rocket motor to the shaft a few in ...
.


UH-1V

The UH-1V is a version of the UH-1H converted by the US Army Electronics Command for
MEDEVAC Medical evacuation, often shortened to medevac or medivac, is the timely and efficient movement and en route care provided by medical personnel to wounded being evacuated from a battlefield, to injured patients being evacuated from the scene of a ...
use. The aircraft have several upgrades including a
radar altimeter A radar altimeter (RA), also called a radio altimeter (RALT), electronic altimeter, reflection altimeter, or low-range radio altimeter (LRRA), measures altitude above the terrain presently beneath an aircraft or spacecraft by timing how long it t ...
, DME, ILS and a rescue hoist. The first aircraft were supplied to the New Hampshire National Guard.


EH-1X

The EH-1X was an improved EH-1H that was equipped with the AN/ALQ-151 system and configured for the airborne jamming, radio intercept and DF role. Ten EH-1Xs were built starting in late 1976 under Project Quick Fix IIA.


JUH-1 SOTAS

The JUH-1 was a modified UH-1H an AN/APS 94 radar system mounted in a rotating boom on the belly, where the cargo hook had been. The aircraft's skid landing gear was modified to retract allowing the radar antennae to rotate while in flight. The JUH-1s also incorporated an autopilot and improved navigation avionics. The radar system was connected by
datalink A data link is the means of connecting one location to another for the purpose of transmitting and receiving digital information (data communication). It can also refer to a set of electronics assemblies, consisting of a transmitter and a recei ...
to a ground station for analysis of the radar images. At least four UH-1Hs were modified to JUH-1s for use by the US Army in Europe and Korea for use as technology demonstrators in the Stand Off Target Acquisition System (SOTAS) program. They were first deployed in 1975 but by 1986 they had been replaced by the EH-60 Black Hawk.


UH-1Y

The UH-1Y Venom is an upgraded
UH-1N Twin Huey The Bell UH-1N Twin Huey is a medium military helicopter designed and produced by the American aerospace manufacturer Bell Helicopter. It is a member of the extensive Huey family, the initial version was the CUH-1N Twin Huey (later CH-135 Twi ...
for the
US Marines The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through combi ...
that was first flown on 18 November 2006, developed as part of the
H-1 upgrade program The H-1 upgrade program is the United States Marine Corps's program to develop the AH-1Z Viper and UH-1Y Venom military helicopters to replace its aging fleets of AH-1W SuperCobras and UH-1N Twin Hueys. The contract was awarded in 1996 to Bell Hel ...
.


Notes


References

Listed in alphabetical order by author: * * * {{Huey family 1950s United States helicopters 1960s United States helicopters 1970s United States helicopters 2000s United States helicopters