UH-1N Twin Huey
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| UH-1N Iroquois CH-135 Twin Huey | |
|---|---|
| Marine UH-1Ns lifting from a field outside Baghdad on April 10, 2003. | |
| Type | Multipurpose utility helicopter |
| Manufacturer | Bell Helicopter Textron |
| Maiden flight | April 1969 |
| Introduced | October 1970 |
| Primary users | United States Marine Corps Canadian Forces United States Navy United States Air Force |
| Developed from | UH-1H Iroquois |
| Variants | Bell 212 UH-1Y Venom |
The Bell UH-1N Twin Huey is a medium military helicopter that first flew in April, 1969.[1] The UH-1N has a fifteen seat configuration, with one pilot and fourteen passengers. In cargo configuration the UH-1N has an internal capacity of 220 ft³ (6.23 m³). An external load of 5,000 lb (2,268 kg) can be carried by the UH-1N.
Contents |
[edit] Development
Based on the stretched fuselage Bell 205, the Bell 212 was originally developed for the Canadian Forces (CF) under the designation CUH-1N Twin Huey. Later the CF adopted a new designation system and the aircraft was re-designated as the CH-135 Twin Huey.[2] The CF approved the development of the aircraft on May 1, 1968[1] and purchased 50 aircraft, with deliveries commencing in May 1971.[3]
The US military came very close to not procuring the Twin Huey. The purchase of the aircraft for US military use was opposed by the Chairman of the House Armed Services Committee at the time, Mendal Rivers. Rivers took this position because the aircraft powerplant, the Pratt & Whitney Canada PT6T was produced in Canada. The Canadian government had not supported US involvement in Vietnam and had opposed US policies in southeast Asia, as well as accepting US draft dodgers. Rivers was also concerned that procurement of the engines would result in a negative trade deficit situation with Canada. Congress only approved the purchase when it was assured that a US source would be found for the PT6T engines. As a result the United States military services ordered 294 Bell 212s under the designation UH-1N, with deliveries commencing in 1970.[3]
Unlike in the Canadian Forces, in US service, the UH-1N retained the official name "Iroquois" from the single engined UH-1 variants, although US service personnel refer to the aircraft as a "Huey" or "Twin Huey".[4]
The Bell 412 is a further development of the Bell 212, the major difference being the composite four-blade main rotor.[3]
[edit] Design
The UH-1N's main rotor is powered by a PT6T-3 Turbo Twin Pac made up of two Pratt & Whitney Canada PT6T turboshaft engines. They are capable of producing up to 1,342 kW (1,800 shp). Should one engine fail the remaining engine can deliver 671 kW (900 shp) for 30 minutes or 571 kW (765 shp) enabling the UH-1N to maintain cruise performance at maximum weight.[3]
The United States Marine Corps (USMC) modified a large number of their UH-1Ns with a Stability Control Augmentation System (SCAS) which provides servo inputs to the rotor head to help stabilize the aircraft during flight. This modification removed the gyroscopic "Stabilization Bar" on top of the main rotor head, instead relying on the computer system for stability.
[edit] Operational history
[edit] Significant Flights
On March 6 1972, Hendrick V. Gorick of the United States Navy Antarctic Development Squadron Six (VXE-6) jumped at an altitude of 20,500 ft (6,248 m) from a UH-1N helicopter. In doing so he set a record for parachute jumping over the Antarctic continent.
[edit] Variants
[edit] U.S. variants
- UH-1N Iroquois
- Initial production model, used by the USAF, USN, and USMC. Over the years the primary operators, the USMC has developed a number of upgrades for the aircraft including improved avionics, defenses, and a FLIR turret.
- VH-1N
- VIP transport configuration[1]
- HH-1N
- SAR variant.[1]
- UH-1Y Venom
- Essentially a massive UH-1N replacement/upgrade for the USMC, designed to coincide with a similar upgrade for the AH-1W attack helicopter to AH-1Z Viper standard.
[edit] Foreign variants
- Agusta-Bell AB 212
- Civil or military utility transport version. Built under license in Italy by Agusta.
- Agusta-Bell AB 212ASW
- Anti-submarine warfare, anti-shipping version of the AB 212 helicopter. Operated by the Italian Navy, Hellenic Navy and Islamic Republic of Iran Navy Aviation.[3]
- CH-135 Twin Huey
- Canadian version of the UH-1N.[1][3]
- CUH-1N Twin Huey
- Original Canadian Armed Forces designation for the UH-1N utility transport helicopter.[1][3]
[edit] Operators
- Argentine Air Force (Bell 212)
- Argentine Army (Bell 212)
- Austrian Air Force (Agusta-Bell 212, Bell 212)
- Bangladesh Air Force (Bell 212)
- Bolivian Air Force (Bell 212)
- Canadian Forces (CH-135)
- 403 (Helicopter) Operational Training Squadron[5]
- 408 Tactical Helicopter Squadron[6]
- 422 Tactical Helicopter Squadron (disbanded 16 August 1980)[5]
- 424 Transport & Rescue Squadron[7]
- 427 Tactical Helicopter Squadron[8]
- 430 Tactical Helicopter Squadron (430e Escadron Tactique d'Hélicoptères)[9]
- 444 Combat Support Squadron[10]
- VU32 - Navy Utility Squadron[11]
- Aerospace Engineering Test Establishment[12]
- Base Flight Cold Lake[13]
- Base Rescue Goose Bay[10]
- Rotary Wing Aviation Unit, Canadian Contingent, Multinational Force and Observers, El Gorah Egypt, 1986-1990[14]
- Canadian Coast Guard (Bell 212)
- Chilean Air Force (Bell 212)
- Colombian Air Force (Agusta-Bell 212)
- Colombian Army (UH-1N)
- Colombian Navy (Bell 212)
- Colombian Police (Bell 212)
- National Police (Bell 212)
- German Federal Police (Bell 212)
- Hellenic Air Force (Bell 212)
- Hellenic Army (Bell 212)
- Hellenic Navy (Bell 212ASW/EW)
- Italian Air Force (Agusta-Bell 212)
- Italian Navy (Agusta-Bell 212ASW)
- Polizia di Stato (Agusta-Bell 212)
- Jamaica Defence Force (Bell 212)
- Royal Saudi Air Force (Agusta-Bell 212)
- Serbian Police
- Spanish Army (Agusta-Bell 212)
- Spanish Navy (Agusta-Bell 212ASW)
- Sri Lanka Air Force (Bell 212)
- Royal Thai Army
- Royal Thai Navy (Bell 212)
- Royal Thai Police Wing
- Turkish Army (Agusta-Bell 212)
- Turkish Navy (Agusta-Bell 212ASW)
- Army Air Corps (Bell 212)
[edit] Specifications (USMC UH-1N, as modified)
Data from USMC UH-1N Fact Sheet,[15] The International Directiory of Military Aircraft, 2002-2003[16]
General characteristics
- Crew: 4 (Pilot, copilot, crew chief, gunner)
- Capacity: 6-8 combat-equipped troops, or equivalent cargo
- Length: 41 ft 8 in (12.69 m)
- Rotor diameter: 48 ft 0 in (14.6 m)
- Height: 14 ft 5 in (4.4 m)
- Disc area: 1,808 ft² (168.0 m²)
- Empty weight: 6,000 lb (2,721.5 kg)
- Loaded weight: 10,500 lb (4,762.7 kg)
- Useful load: 4500 lb (2038.0 kg)
- Max takeoff weight: 10,500 lb (4,762.7 kg)
- Powerplant: 1× Pratt & Whitney Canada T400-CP-400 turboshaft, 1,800 shp (1,342 kW)1250 shp
Performance
- Never exceed speed: knots (mph, km/h)
- Maximum speed: 120 knots (135 mph, 220 km/h)
- Cruise speed: 110 knots (126 mph, 207.3 km/h)
- Stall speed: knots (mph, km/h)
- Range: nm (286 mi, 460 km)
- Service ceiling 17,300 ft (5,273 m)
- Rate of climb: 1,755 ft/min (8.9 m/s)
- Disc loading: lb/ft² (kg/m²)
- Power/mass: hp/lb (W/kg)
Armament
- 2.75-inch rocket pods,
- GAU-16 .50 Cal. Machinegun,
- GAU-17 7.62mm minigun or M240 7.62mm lightweight machinegun
[edit] Twin Huey badges
- Crew: 4 (Pilot, copilot, crew chief, gunner)
- Capacity: 6-8 combat-equipped troops, or equivalent cargo
- Length: 41 ft 8 in (12.69 m)
- Rotor diameter: 48 ft 0 in (14.6 m)
- Height: 14 ft 5 in (4.4 m)
- Disc area: 1,808 ft² (168.0 m²)
- Empty weight: 6,000 lb (2,721.5 kg)
- Loaded weight: 10,500 lb (4,762.7 kg)
- Useful load: 4500 lb (2038.0 kg)
- Max takeoff weight: 10,500 lb (4,762.7 kg)
- Powerplant: 1× Pratt & Whitney Canada T400-CP-400 turboshaft, 1,800 shp (1,342 kW)1250 shp
Performance
- Never exceed speed: knots (mph, km/h)
- Maximum speed: 120 knots (135 mph, 220 km/h)
- Cruise speed: 110 knots (126 mph, 207.3 km/h)
- Stall speed: knots (mph, km/h)
- Range: nm (286 mi, 460 km)
- Service ceiling 17,300 ft (5,273 m)
- Rate of climb: 1,755 ft/min (8.9 m/s)
- Disc loading: lb/ft² (kg/m²)
- Power/mass: hp/lb (W/kg)
Armament
- 2.75-inch rocket pods,
- GAU-16 .50 Cal. Machinegun,
- GAU-17 7.62mm minigun or M240 7.62mm lightweight machinegun
[edit] Twin Huey badges
- Never exceed speed: knots (mph, km/h)
- Maximum speed: 120 knots (135 mph, 220 km/h)
- Cruise speed: 110 knots (126 mph, 207.3 km/h)
- Stall speed: knots (mph, km/h)
- Range: nm (286 mi, 460 km)
- Service ceiling 17,300 ft (5,273 m)
- Rate of climb: 1,755 ft/min (8.9 m/s)
- Disc loading: lb/ft² (kg/m²)
- Power/mass: hp/lb (W/kg)
Armament
- 2.75-inch rocket pods,
- GAU-16 .50 Cal. Machinegun,
- GAU-17 7.62mm minigun or M240 7.62mm lightweight machinegun
[edit] Twin Huey badges
- 2.75-inch rocket pods,
- GAU-16 .50 Cal. Machinegun,
- GAU-17 7.62mm minigun or M240 7.62mm lightweight machinegun
[edit] Twin Huey badges
CH135TwinHueyBadge.JPG
CH-135 Twin Huey badge worn by some Canadian Forces air and ground crew, 1980s |
408UTTHFltBadge.JPG
408 Tactical Helicopter Squadron UTTH Flight badge worn by CH-135 Twin Huey crews circa 1990. The badge is based on the shield of the province of Alberta |
[edit] Canadian CH-135 Twin Huey Gallery
BellCH-135TwinHuey135102.JPG
CH-135 Twin Huey 135102 serving with the Multinational Force and Observers Sinai, Egypt, 1989. |
BellCH-135TwinHuey135137.JPG
CH-135 Twin Huey 135137 in the original blue-gray and green camouflage pattern worn by these aircraft prior to 1986/88. |
BellCH135135TwinHuey.JPG
CH-135 Twin Huey 135135 in the early-style SAR markings, 1988. This aircraft was serving with Base Rescue Goose Bay and had formerly been assigned to 424 Transport & Rescue Squadron, CFB Trenton. |
BellCH-135TwinHuey135127.JPG
CH-135 Twin Huey 135127 from Base Rescue Goose Bay in the later SAR scheme used after 1986/88. |
BellCH-135TwinHuey135103A.JPG
CH-135 Twin Huey 135103 in special flight test markings. The aircraft was used by the Aerospace Engineering Test Establishment at CFB Cold Lake, 1987. |
BellCH-135TwinHuey135103B.JPG
CH-135 Twin Huey 135103 after repainting at Bristol Aerospace in the in anti-IR olive and green scheme used on all non-SAR/ non-peacekeeping Twin Hueys after 1986/88. The aircraft was returned to the Aerospace Engineering Test Establishment at CFB Cold Lake, 1987. |
BellCH-135TwinHuey135114.jpg
CH-135 Twin Huey 135114 in the Canada Aviation Museum 09 October 2006. This aircraft is painted in the anti-IR camouflage scheme, but served its time painted yellow with 424 Transport & Rescue Squadron, CFB Trenton, Base Rescue Goose Bay and 444 Combat Support Squadron, CFB Goose Bay. |
[edit] References
- ^ a b c d e f Mutza, Wayne: UH-1 Huey in action, pages 31-33. Squadron/Signal Publications, Carrollton, Texas, 1986. ISBN 0-89747-179-2
- ^ Air Force Public Affairs / Department of National Defence (May 19, 2004). Bell CH-135 Twin Huey. Retrieved on 2007-10-01.
- ^ a b c d e f g Drendel, Lou: Huey, pages 14-17. Squadron/Signal Publications, Carrollton, Texas, 1983. ISBN 0-89747-145-8
- ^ Drendel, Lou: Huey, page 9. Squadron/Signal Publications, Carrollton, Texas, 1983. ISBN 0-89747-145-8
- ^ a b Air Force Public Affairs / Department of National Defence (June 13, 2007). 403 Squadron Activated as Operational Training Squadron. Retrieved on 2007-10-23.
- ^ Air Force Public Affairs / Department of National Defence (June 13, 2007). 408 Tactical Helicopter Squadron (THS) History. Retrieved on 2007-10-23.
- ^ Air Force Public Affairs / Department of National Defence (May 30, 2006). 424 Squadron History. Retrieved on 2007-10-23.
- ^ Air Force Public Affairs / Department of National Defence (June 13, 2007). History of 427 Special Operations Aviation Squadron. Retrieved on 2007-10-23.
- ^ Air Force Public Affairs / Department of National Defence (June 13, 2007). 430 Squadron. Retrieved on 2007-10-23.
- ^ a b Air Force Public Affairs / Department of National Defence (June 15, 2007). 444 Squadron History. Retrieved on 2007-10-23.
- ^ AEROWARE / RCAF.com (undated). Utility Squadron VU 32. Retrieved on 2007-10-24.
- ^ Shaw, Robbie: Superbase 18 Cold Lake- Canada's Northern Guardians, page 86. Osprey Publishing, London, 1990. ISBN 0-85045-910-9
- ^ Air Force Public Affairs / Department of National Defence (June 15, 2007). 417 Combat Support Squadron - History. Retrieved on 2007-10-23.
- ^ 10 Tactical Air Group: Canadian Contingent Multinational Force and Observers Handbook (unclassified), page A-1. DND, Ottawa, 1986.
- ^ USMC UH-1N Fact Sheet. USMC. Retrieved on 2007-07-09.
- ^ Frawley, Gerard: The International Directiory of Military Aircraft, page 33. Aerospace Publications Pty Ltd, 2002. ISBN 1-875671-55-2
- Chant, Christopher, Fighting Helicopters of the 20th Century, Graham Beehag Books, Christchurch, Dorset, England (1996).
- Debay, Yves, Combat Helicopters, France: Histoire & Collections (1996)
- Francillon, Rene, J. Vietnam: The War in the Air New York: Arch Cape Press (1987)
- Mesko, Jim, Airmobile: The Helicopter War in Vietnam, Squadron Signal Publications (1984).
- Specifications for 204, 205 and 214 Huey Plus
- Mutza, Wayne. UH-1 Huey in Colors. Carrolton, TX: Squadron Signal. ISBN 0-89747-279-9
[edit] External links
[edit] Related content
Related development
Designation sequence
- U.S. Military:
- Canadian Forces:
Related lists
- U.S. Military:
- Canadian Forces:
Related lists
Bell Aircraft/Bell Helicopter |
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