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Bell AH-1J “SeaCobra”
United States — USMC twin-engine close support and attack helicopter


Archive Photos 1,2


Bell AH-1J “SeaCobra” (BuNo 157784) on display (6/22/2007) at the Flying Leatherneck Aviation Museum, MCAS Miramar, San Diego, California (John Shupek photos copyright © 2007 Skytamer Images)

Bell AH-1J “SeaCobra” (BuNo 159224, c/n 26064) on display (10/6/2012) at the The U.S. Naval Museum of Armament and Technology, NAWS China Lake, California (Photos by Peter S. Kuntz)

Bell AH-1J “SeaCobra” (BuNo 159227) on display (c.2000) at the Patuxent River Naval Air Museum, Lexington Park, MD (John Shupek photos copyright © 2000 Skytamer Images)

Overview ³


The Bell AH-1 “SuperCobra” is a twin-engine attack helicopter based on the US Army's AH-1 “Cobra”. The twin “Cobra” family includes the AH-1J “SeaCobra”, the AH-1T “Improved SeaCobra”, and the AH-1W “SuperCobra”. The Bell AH-1W is the backbone of the United States Marine Corps's attack helicopter fleet, but will be replaced in service by the Bell AH-1Z “Viper” upgrade in the next decade.

  • Role: Attack helicopter
  • Manufacturer: Bell Helicopter
  • First flight: 1969 (J)
  • Introduction: 1971 (J), 1986 (W)
  • Status Active: service
  • Primary users: United States Marine Corps, Islamic Republic of Iran Army, Republic of China Army, Turkish Army
  • Produced: 1970-present
  • Number built: 1,271+
  • Unit cost $US: AH-1W: US $10.7 million
  • Developed from: AH-1 Cobra
  • Variants: AH-1Z Viper, Bell YAH-63/Bell 409, Panha 2091

Design and Development ³


The Bell AH-1 “Cobra” was developed in the mid-1960's as an interim gunship for the U.S. Army for use in Vietnam. The “Cobra” shared the proven transmission, rotor system, and the T53 turboshaft engine of the Bell UH-1 “Huey”. By June 1967, the first Bell AH-1G “HueyCobras” had been delivered. Bell built 1,116 AH-1G's for the U.S. Army between 1967 and 1973, and the “Cobras” chalked up over a million operational hours in Vietnam.

The U.S. Marine Corps was very interested in the Bell AH-1G “Cobra”, but preferred a twin-engined version for improved safety in over-water operations, and also wanted a more potent turret-mounted weapon. At first, the Department of Defense had balked at providing the Marines with a twin-engined version of the “Cobra”, in the belief that commonality with Army AH-1G's outweighed the advantages of a different engine fit. However, the Marines won out and awarded Bell a contract for 49 twin-engined AH-1J “SeaCobras” in May 1968. As an interim measure, the U.S. Army passed on 38 AH-1G's to the Marines in 1969. The Bell AH-1J “SeaCobra” also received a more powerful gun turret. It featured a three barrel 20 mm XM197 cannon that was based on the six barrel M61 Vulcan cannon.

The Marine Corps requested greater load carrying capability in high temperatures for the “Cobra” in the 1970's. Bell used systems from the Model 309 to develop the AH-1T. This version had a lengthened tailboom and fuselage with an upgraded transmission and engines from the 309. Bell designed the AH-1T to be more reliable and easier to maintain in the field. The version was given full TOW capability with targeting system and other sensors. An advanced version, known as the AH-1T+ with more powerful T700-GE-700 engines and advanced avionics was proposed to Iran in the late 1970s, but the overthrow of the Shah of Iran resulted in the sale being canceled.

In the early 1980s, the U.S. Marine Corps sought a new navalized helicopter, but was denied funding to buy the AH-64 “Apache” by Congress in 1981. The Marines in turn pursued a more powerful version of the AH-1T. Other changes included modified fire control systems to carry and fire AIM-9 “Sidewinder” and AGM-114 “Hellfire” missiles. The new version was funded by Congress and received the AH-1W designation. At least 266 were delivered.

The Bell AH-1T+ demonstrator and Bell AH-1W prototype was later tested with a new experimental composite four blade main rotor system. The new system offered better performance, reduced noise and improved battle damage tolerance. Lacking a USMC contract, Bell developed this new design into the AH-1Z with its own funds. By 1996, the Marines were again not allowed to order the AH-64. Developing a marine version of the “Apache” would have been expensive and it was likely that the Marine Corps would be its only customer. They instead signed a contract for upgrading 180 AH-1W's into AH-1Z's.

The Bell AH-1Z “Viper” features several design changes. The Bell AH-1Z “Viper's” two redesigned wing stubs are longer with each adding a wing-tip station for a missile such as the AIM-9 “Sidewinder”. Each wing has two other stations for 70 mm (2.75 in) “Hydra” rocket pods, or AGM-114 “Hellfire” quad missile launcher. The “Longbow” radar can be mounted on a wing tip station.

Operational History ³


During the closing months of the United States' involvement in the Vietnam war, the Marine Corps embarked the Bell AH-1J “SeaCobra” assigned to HMA-369 (now HMLA-369) in “USS Cleveland” (LPD-7), and later “USS Dubuque” (LPD-8) for sea-based interdiction of the Ho Chi Minh Trail in North Vietnam in the vicinity of Hon La (Tiger) Island. These were termed Marine Hunter-Killer (MARHUK) Operations and lasted from June to December 1972.

Marine “Cobras” took part in the invasion of Grenada, during “Operation Urgent Fury” in 1983, flying close-support and helicopter escort missions. Two Marine Bell AH-1T's were shot down and three crewmen killed. USMC Cobras participated in the Persian Gulf escort operations in the late 1980s, and sank three Iranian patrol boats while losing a single AH-1T to Iranian anti-aircraft fire. USMC “Cobras” from the “USS Saipan” flew "top cover" during an evacuation of American and other foreign nationals from Liberia in 1990.

During the 1983 Marine multinational force operations off the coast of Beirut, Lebanon during that nations civil war the AH-1 was deployed. Faced with the possibility of a threat involving the suicide delivery of airborne explosives loaded on light civil aircraft, the Bell AH-1's were employed armed with “Sidewinder” missiles and guns on a ready-alert status as an air defense asset in the absence of carrier based fixed wing cover or STOVL fighters.

During “Operation Desert Shield” in 1990, and “Operation Desert Storm” in Jan-Feb 1991, “Cobras” and “SeaCobras” deployed to Iraq in a support role. A total of 78 Marine “SeaCobras” flew 1,273 sorties with no combat losses. Three Bell AH-1s were lost in accidents during combat operations and afterwards. Marine Bell AH-1W's destroyed 97 tanks, 104 armored personal carriers and vehicles, and two anti-aircraft artillery sites during the 100-hour ground campaign.

Iranian Bell AH-1J “SeaCobras” participated in air combat with Iraqi Mil Mi-24 “Hinds” on several separate occasions during the Iran-Iraq War. The results of these engagements are disputed. One document cited that "Iranian AH-1J's engaged Iraqi Mil MI-8 “Hip” and Mil MI-24 “Hind” helicopters. Unclassified sources report that the Iranian AH-1 pilots achieved a 10:1 kill ratio over the Iraqi helicopter pilots during these engagements (1:5). Additionally, Iranian AH-1 and Iraqi fixed wing aircraft engagements also occurred. Others claim that in the entire eight-year conflict, ten Iranian AH-1J's were lost in combat, compared to six Iraqi Mil Mi-24 “Hinds”. The skirmishes are described as fairly evenly matched in another source. Iranian AH-1J's are still operating today and have undergone indigenous upgrade programs. In 1988, two Soviet MiG-23's shot down a pair of Iranian AH-1J's that had strayed into western Afghan airspace.

Marine “Cobras” provided support for the US humanitarian intervention in Somalia, during “Operation Restore Hope” in 1992-1993. They were also employed during the US invasion of Haiti in 1994. USMC “Cobras” were used in US military interventions in the former Yugoslavia in the 1990s, and assisted in the rescue of USAF Captain Scott O'Grady 1995, after his F-16 was shot down by a SAM. The Turkish Army has been using its AH-1 gunships for their operations against rebel Kurds on both sides of the Iraqi border.

Bell AH-1 “Cobras” continue to operate with the U.S. Marine Corps. USMC “Cobras” were also used in operations throughout the 1990s. USMC “Cobras” have also served in “Operation Enduring Freedom” in Afghanistan and in “Operation Iraqi Freedom” in the ongoing conflict in Iraq. While new replacement aircraft were considered as an alternative to major upgrades of the AH-1 fleet, Marine Corps studies showed that an upgrade was the most affordable, most supportable and most effective solution for the Marine Corps light attack helicopter mission.

Variants ³


Twin-Engine

  • AH-1J SeaCobra: Original twin engine version.
  • AH-1J International: Export version of the AH-1J SeaCobra.
  • AH-1T Improved SeaCobra: Improved version with extended tailboom and fuselage and an upgraded transmission and engines.
  • AH-1W SuperCobra: ("Whiskey Cobra"), day/night version with more powerful engines and advanced weapons capability.
  • AH-1Z Viper: ("Zulu Cobra"), in conjunction with the UH-1Y Venom upgrade. Version includes an upgraded 4 blade main rotor and adds the Night Targeting System (NTS).
  • Model 309 King Cobra: Experimental version powered by two engines.
  • Cobra Venom: Proposed version for the United Kingdom.
  • AH-1RO Dracula: Proposed version for Romania.
  • AH-1Z King Cobra: AH-1Z offered under Turkey's ATAK program; selected for production in 2000, but later canceled when Bell and Turkey could not reach an agreement on production.
  • Panha 2091: unlicensed Iranian upgrade of the AH-1J International.

Operators ³


  • Iran: Islamic Republic of Iran Army received 202 AH-1J Internationals. Iran operates 50 AH-1Js as of Nov. 2008. An unknown number of the Panha 2091, an unlicensed, locally-made upgrade of AH-1J International serve with the Army and Revolutionary Guards.
  • Republic of China (Taiwan): Republic of China Army received 63 AH-1W's and operates 59 AH-1W's as of 2008.
  • Turkey: Turkish Army operates 7 AH-1W SuperCobras as of 2008.
  • United States: United States Marine Corps has approximately 167 AH-1W's as of 2008.
    • HMLA-167, MCAS New River
    • HMLA-169, MCAS Camp Pendleton
    • HMLA-267, MCAS Camp Pendleton
    • HMLA-269, MCAS New River
    • HMLA-367, MCAS Camp Pendleton
    • HMLA-369, MCAS Camp Pendleton
    • HMLA-467, MCAS New River
    • HMLA-773, NAS Atlanta
    • HMT-303, MCAS Camp Pendleton
  • Due to a re-organization within Marine aviation, the Marine Corps will be adding three active duty light/attack helicopter squadrons in the next few years. It will add HMLA-469 and HMLA-567 during 2009.
  • United States Navy used 7 AH-1W's for test and evaluation purposes on behalf of the USMC.

Specifications AH-1J SeaCobra ³


General Characteristics

  • Crew: 2: pilot, CPG (co-pilot/gunner)
  • Length: 44 ft 3 in (13.5 m)
  • Rotor diameter: 43 ft 11 in (13.4 m)
  • Height: 13 ft 5 in (4.1 m)
  • Empty weight: 6,595 lb (2,998 kg)
  • Max takeoff weight: 9,979 lb (4,525 kg)
  • Powerplant: 1 × Pratt & Whitney Canada T400-CP-400 (PT6T-3 Twin-Pac) turboshaft, 1,800 shp (1,342 kW)
  • Total engine output: 1,530 shp (1,125 kW) limited by helicopter drive train
  • Rotor systems: 2 blades on main rotor, 2 blades on tail rotor

Performance

  • Maximum speed: 190 knots (218 mph, 352 km/h)
  • Range: 308 nm (355 mi, 571 km)
  • Service ceiling: 11,398 ft (3,475 m)

Armament

  • M197 3-barreled 20 mm "Gatling-style" cannon in the M97 turret (750 rounds ammo capacity)
  • 2.75 in (70 mm) Mk 40 or Hydra 70 rockets - 14 rockets mounted in a variety of launchers
  • 5 in (127 mm) Zuni rockets - 8 rockets in two 4-round LAU-10D/A launchers
  • AIM-9 Sidewinder Anti-Aircraft Missiles - 1 mounted on each hardpoint

References


  1. Photos: John Shupek, Copyright © 2000, 2007 Skytamer Images. All Rights Reserved
  2. Photos: Peter S. Kuntz, 10/6/2012
  3. Wikipedia, AH-1 SuperCobra

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