Bell UH-1 Iroquois (Huey)

History

The UH-1 Iroquois "Huey" became an important part of U.S. military operations starting in the 1960s and became more common in the second half of the Cold War. This ubiquitous system became synonymous with U.S. efforts in Vietnam, no doubt because of its inherent ability to fill nearly any desired role.

Although they have always been associated with that war, their legacy has rightfully evolved into something more, thanks to their military and civilian roles throughout the modern world, including search and rescue, assault, transportation and humanitarian ideological work. Although their official name is "Iroquois", the nickname "Huey" persists due to their early designation "HU-1" (later renamed UH-1 in 1962).

As a result, the Iroquois name - until today - is rarely used to refer to the UH-1 family of helicopters.

Huey was developed from advances in turbine technology in the 1950s. Bell produced the turbine-driven Type 47 (XH-13F) in 1954, which was of particular interest to the U.S. Army.

The need for a medical evacuation helicopter was on the US Army's wish list, so Bell set out to develop a solution - the prototype XH-40 (Bell Model 204) was born. The XH-40's maiden flight took place on October 22, 1956, followed by two other XH-40 prototypes powered by the 700-horsepower Lycoming XT-53-L-1 engine.

Six additional development models were then ordered as YH-40 evaluation aircraft. These are basically the same as the XH-40 prototype, but with a full 12 inches more cabin space. One of the YH-40s was retained as a test bed with a Bell 533 turbofan engine and wing assembly. The Type 204 entered production as the U.S. Army's HU-1A, becoming the first turbine-powered helicopter to enter service with the U.S. military.

The 101st Airborne Division, the 57th Medical Detachment and the 82nd Airborne Division will be the first deliveries. The 57th Medical Detachment pioneered the system in Vietnam in March 1962.

All in all, Huey's design is quite functional, albeit more pleasing to the eye than other rotor products developed in the 1950s. The aircraft structure includes the main fuselage, engine and rotor mast sections that house the cockpit and passenger cabin (and associated systems and equipment), and the tail or tail section that includes the tail rotor.

The pilot and co-pilot sit at the very front of the design, and the windowed cockpit provides excellent forward, overhead, side and downward visibility. Access to both cockpit seating positions is via automotive-style gullwing doors.

The cabin features a large sliding door with windows on either side of the fuselage for easy access (in most Vietnamese-era images these doors are almost always left open). The single engine was mounted aft of the root of the cab, with the rotor mast extending upwards in front of the engine. The rotor blades of the first model were a simple two-blade arrangement with a rotor mast for added stability (the latest Huey version has a four-blade rotor system).

The engine was exhausted aft at the bottom of the tail. The tail itself is almost half the length of the entire fuselage and features horizontal fins about halfway down the tail. The section ends with a single vertical tail adorned with a two-blade tail rotor system mounted on the port side (the latest Huey has a four-blade tail rotor). The landing gear consists of a pair of undercarriage fixed in two areas, allowing landing and take-off on almost any type of surface, making it useful for both land-based and sea-based operators.

Throughout production - with the exception of the twin-engine Huey - the base series UH-1 Huey will retain this unique and highly recognizable design.

The transportation origins and inherently large cabin space of the Huey was designed from the start to serve a large number of passengers. The passenger compartment is equivalent to 14 combat readiness troops. In MedEvac characters, this arrangement can be replaced with up to 6 medical throws.

Base staff can range from 1 to 4 people, depending on needs and the roles and equipment used.

The UH-1 airframe proved to be highly adaptable throughout its tenure, especially when it was a model combat helicopter in the Vietnam War. Standard armament includes the use of a pivot mounted M60 7.62mm machine gun or dedicated external mounts for two 7.62mm revolving machine gun mounts, 2-, 7- or 19-shot 2.75" rocket pods and 7.62mm machine guns. U.S.

Army Hueys were nicknamed "Cobras" when armed with machine guns and "Pigs" when they carried rocket pods, while unarmed Hueys became "oil slicks" (similarly referring to the U.S. Navy and U.S. Marine Corps The transport plane was named "Dolphin" and the attack helicopter was named "Shark").

During the Vietnam War, many other weapon configurations were tested on the Huey airframe, resulting in a large number of experimental systems bearing the Model X designation. These attempts included the use of air-to-surface missiles, 7.62mm miniguns, 20mm and 30mm cannon weapons, mortars, heavy 12.7mm miniguns and 40mm grenade launchers.

All in all, Ser i.e. they have adapted to almost any character imaginable, although many of these powerful weapons these arrangements have never been accepted by any official character.

Of all the conflicts Huey has ever been in, there's no question that her involvement in the Vietnam War really cemented her legacy. The Huey later became a symbolic symbol of America's involvement in the war, with images of troops descending from hovering helicopters appearing on American television every night. The Hueys in Vietnam were asked to take on a variety of roles that most aircraft at the time could do.

The UH-1 is used in its intended role in troop transport, but is also used in critical roles such as medical evacuation, search and rescue operations, general transport, VIP transport, command and control, and as an attack helicopter. Huey's deployments, armament, and tactics typically change throughout the war based on battlefield experience and adapt to current needs. Models on display during the war included the UH-1A, B, C, D and H models.

The UH-1B and UH-1C Hueys were eventually replaced in the gunship role by dedicated AH-1 Cobra two-seater attack helicopters. Commissioned to arrive in August 1967 (AH-1G).

In total, more than 3,300 UH-1 Hueys were killed in the conflict, along with some 2,200 pilots, while more than 5,000 units were brought in across the region.

Production runs of UH-1 resulted in about a dozen major variants, some with sub-variants. The original production variant became the HU-1A, using an earlier form designation system, which eventually changed from 1962 to the UH-1A. Production was 182 UH-1As.

These systems were followed by four YUH-1B prototypes, resulting in UH-1B production models, which were essentially "upgraded" A models with improved rotors and other minor external changes. The UH-1C was fitted with improved blades, an improved rotor head, and new engines, and a total of 767 were built.

The first major "deviation" from the original production model was the UH-1D, of which approximately 2,008 prototypes were produced. These were based on the Bell 205, which itself was nothing more than a long hull version of the Bell 204, while using the rotor diameter, range and power of the Lycoming T53-L-9A, T53-L-11D 1,100 hp engines or an increased 1,400 hp Combined Signal Engine (ASE) T53-L-13B turboshaft. In this version, the side sliding doors with double windows have also been enlarged. The U.S.

Army commissioned these as personnel carriers starting in 1963 to replace its aging Sikorsky CH-34 Chcktaw fleet, and many were eventually upgraded to the upcoming UH-1H standard. The UH-1D can carry 2 people and can hold up to 13 soldiers at the same time.

Production versions of the UH-1D (and UH-1H) were equipped with standard door-mounted M23 M60D 7.62mm machine guns on the M23 subsystem to provide cover fire along the flanks. Early production UH-1Ds were equipped with XM3 23-tube rocket launchers, M5 40mm grenade launchers and M6 quad M60C machine gun mounts for gunships.

Ultimately, the large cabin space of the D models differentiated them as primarily utility helicopters, while the smaller UH-1B and UH-1C were therefore primarily used as attack helicopters.

The UH-1E became a USMC product based on the UH-1B and UH-1C models. 192 of this type were built. The UH-1F also entered service with the U.S. Air Force and was also based on the UH-1B and UH-1C models. The F model is further differentiated by the use of a 1,325-horsepower General Electric T-58-GE-3 turboshaft engine.

A total of 120 of these Hueys were produced.

The UH-1H was a substantially similar production version of the UH-1D, of which approximately 5,435 were built, and featured an improved 1,400 hp Lycoming T-53-L-13B turboshaft engine. The Model H has the same basic armament as the UH-1D - a standard M23 M60D 7.62mm machine gun mounted on the door.

Likewise, the passenger seat provides space for 13 combat-ready troops. Other changes include a revised all-metal dual-blade semi-rigid main rotor system and a hinged dual-blade delta rigid tail rotor system. The H model became the production model for the entire Hueys line. Production extended from 1965 to 1986 and was also licensed in Turkey and Taiwan.

A special H variant was developed in the six-man (2 pilots and 4 gunners) UH-1H "Nighthawk", which was equipped with a Zenon searchlight system and M134 7.62mm machine gun armament for night work. Other weapons include two M60D 7.62mm machine guns and one M2HB 12.7mm machine gun.

The US Navy uses the purpose-built HH-1K (based on the Bell 204) for search and rescue. The UH-1M is a special gunship model equipped with a Lycoming T-53-L-13 1,400 hp engine.

The UH-1N is significantly different from previous Huey products, as this model version is equipped with a twin-turboshaft engine. These aircraft were built to the design of the Bell 212, also named "Twin Pac". The UH-1P is a UH-1F variant used by the United States Air Force for the 20th Special Operations Squadron "Green Hornet". The UH-1V became a dedicated U.S.

Army medical evacuation model, accommodating 6 stretchers and 1 crew, while the UH-1Y emerged as a new Bell product designed to empower operators of its current UH-1N system to upgrade.

At the time of writing, the USMC has begun deliveries (early 2009) of an estimated 123 UH-1V "Venom" model helicopters. The first battle of this variant was completed on December 20, 2001, and production now marks a new generation of Hueys. While the Venom retains the general look of its previous version, it is an all-new modernized Huey with a four-blade composite main rotor, twin-engine layout, four-blade tail rotor, FLIR, fully digital cockpit sports multifunction display, and dual-hue Improvements to Iraqi base maximum speed, range and take-off weight.

This modernization will undoubtedly add decades to Huey's lifespan.

The U.S. Army has phased out its frontline UH-1 fleet, replacing them with the Sikorsky UH-60 Blackhawk series, while maintaining about 700 Hueys over the next few years. The U.S.

Air Force still uses Hueys in limited utility roles as needed, but overall, the Sikorsky UH-60 family is poised to be the next U.S. military workhorse.

In addition to Bell's localized production of its Huey series, the helicopter is produced in Italy under the Agusta-Bell banner, in Japan under the Fuji-Bell name, in Germany via Dornier Flugzeugwerke and in Taiwan via AIDC. To date, total Huey production in all forms across all operators is estimated at more than 16,000 units.

Operators all over the world - from Afghanistan to Zimbabwe - make the Bell UH-1 Huey possibly the most successful family of helicopters ever. The main users of the Huey Line are the US Army, Australian Army, Philippine Army and Japan Ground Self-Defense Force.

Specification

Basic

Production