Bell AH-1Z Viper: Difference between revisions

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* [[United States Marine Corps]] is receiving AH-1Zs as of January 2011.
* [[United States Marine Corps]] is receiving AH-1Zs as of January 2011.

===Potential Operators===
* [[South Korean Army]] - On September 21, 2012, the U.S. Congress was notified of the possible purchase of 36 AH-1Z Vipers by South Korea. The order would include 84 engines (72 installed and 12 spares), 288 [[AGM-114 Hellfire|AGM-114K3 Hellfire]] missiles, 72 [[AIM-9 Sidewinder|AIM-9M-8 Sidewinder]] missiles, integrated missiles launchers, targeting systems, and radar jammers. The order would be worth $2.6 billion.<ref>[http://www.defense-aerospace.com/article-view/release/138784/us-offers-36-cobra-or-apache-helos-to-korea.html Korea – 36 AH-1Z Cobra Attack Helicopters] - Defense-Aerospace.com, September 25, 2012</ref> The Viper is competing against the [[AH-64 Apache]] and the [[TAI/AgustaWestland T-129]] for the order and a decision is expected by the end of 2012.<ref>[http://www.flightglobal.com/news/articles/usa-issues-fms-documents-for-south-korean-ah-1z-ah-64d-bids-376933/ Korea helicopter bids] - Flightglobal.com, September 26, 2012</ref>


==Specifications (AH-1Z)==
==Specifications (AH-1Z)==

Revision as of 15:12, 26 September 2012

For an overview of the whole Huey family of aircraft, see Bell Huey.
AH-1Z Viper
An AH-1Z from HMLAT-303 at Camp Pendleton
Role Attack helicopter
National origin United States
Manufacturer Bell Helicopter
First flight 8 December 2000
Introduction September 2010
Status In service, in production
Primary user United States Marine Corps
Number built 28
Developed from Bell AH-1 SuperCobra

The Bell AH-1Z Viper[1] is a twin-engine attack helicopter based on the AH-1W SuperCobra, that was developed for the United States Marine Corps. The AH-1Z features a four-blade, bearingless, composite main rotor system, uprated transmission, and a new target sighting system.[2] The AH-1Z is part of the H-1 upgrade program. It is also called "Zulu Cobra" in reference to its variant letter.

Development

Background

Aspects of the AH-1Z date back to the Bell 249 in 1979, which was basically an AH-1S equipped with the four-blade main rotor system from the Bell 412. This helicopter demonstrated Bell's Cobra II design at the Farnborough Airshow in 1980. The Cobra II was to be equipped with Hellfire missiles, a new targeting system and improved engines. Later came the Cobra 2000 proposal which included General Electric T700 engines and a four-blade rotor. This design drew interest from the US Marine Corps, but funding was not available. In 1993, Bell proposed an AH-1W-based version for the UK's new attack helicopter program. The derivative design, named CobraVenom, featured a modern digital cockpit and could carry TOWs, Hellfire or Brimstone missiles. The CobraVenom design was altered in 1995 by changing to a four-blade rotor system. The design lost to the AH-64D later that year however.[3]

H-1 upgrade program

In 1996, the USMC launched the H-1 upgrade program by signing a contract with Bell Helicopter for upgrading 180 AH-1Ws into AH-1Zs and upgrading 100 UH-1Ns into UH-1Ys.[3][4] The H-1 program created completely modernized attack and utility helicopters with considerable design commonality to reduce operating costs. The AH-1Z and UH-1Y share a common tail boom, engines, rotor system, drive train, avionics architecture, software, controls and displays for over 84% identical components.[5]

Bell participated in a joint Bell-Government integrated test team during the engineering manufacturing development (EMD) phase of the H-1 program. The AH-1Z program progressed slowly from 1996 to 2003 largely as a research and development operation.[3] The existing two-blade semi-rigid, teetering rotor system is being replaced with a four-blade, hingeless, bearingless rotor system. The four-blade configuration provides improvements in flight characteristics including increased flight envelope, maximum speed, vertical rate-of-climb, payload and reduced rotor vibration level.[6]

The AH-1Z first flew on 8 December 2000.[7] Bell delivered three prototype aircraft to Naval Air Systems Command (NAVAIR) at Naval Air Station Patuxent River in July 2002, for the flight test phase of the program. Low-rate initial production began in October 2003,[3] with deliveries to run through 2018.[8] In February 2008, the United States Navy adjusted the contract, with the last 40 AH-1Zs to be built as new airframes instead of the previously planned rebuild of AH-1Ws.[9] In September 2008, the Navy requested an additional 46 airframes for the Marine Corps, bringing the total number ordered to 226.[10] In 2010, the Marine Corps plans to order 189 AH-1Zs with 58 of them being new airframes,[11] with deliveries to continue until 2019.[12] On 10 December, the Department of the Navy approved full-rate production.[13][14]

Design

An AH-1Z at an air show displaying four-blade rotors and longer stub wings.

The AH-1Z incorporates new rotor technology with upgraded military avionics, weapons systems, and electro-optical sensors in an integrated weapons platform. It has improved survivability and can find targets at longer ranges and attack them with precision weapons.[5]

The AH-1Z's new bearingless, hingeless rotor system has 75% fewer parts than that of four-bladed articulated systems. The blades are made of composites, which have an increased ballistic survivability, and there is a semiautomatic folding system for storage aboard amphibious assault ships.[5] Its 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 2.75-inch (70 mm) Hydra 70 rocket pods, or AGM-114 Hellfire quad missile launchers. The Longbow radar can also be mounted on a wing tip station.[3]

AH-1Z pilots wear helmet mounted displays.

The Z-model's integrated avionics system (IAS) has been developed by Northrop Grumman. The system includes two mission computers and an automatic flight control system. Each crew station has two 8x6-inch multifunction liquid crystal displays (LCD) and one 4.2x4.2-inch dual function LCD display. The communications suite combines a US Navy RT-1824 integrated radio, UHF/VHF, COMSEC and modem in a single unit. The navigation suite includes an embedded GPS inertial navigation system (EGI), a digital map system and a low-airspeed air data subsystem, which allows weapons delivery when hovering.[6]

The crew are equipped with the Thales "Top Owl" helmet-mounted sight and display system.[2] The Top Owl has a 24-hour day/night capability and a binocular display with a 40° field of view. Its visor projection provides forward looking infrared (FLIR) or video imagery. The AH-1Z has survivability equipment including the Hover Infrared Suppression System (HIRSS) to cover engine exhausts, countermeasure dispensers, radar warning, incoming/on-way missile warning and on-fuselage laserspot warning systems.[5]

The Lockheed Martin target sight system (TSS) incorporates a third-generation FLIR sensor. The TSS provides target sighting in day, night or adverse weather conditions. The system has various view modes and can track with FLIR or by TV.[5] The same system is also used on the UH-1Y Venom and the KC-130J Harvest HAWK.[15]

Operational history

AH-1Z lands on the USS Makin Island

The AH-1Z completed sea-trial flight testing in May 2005.[16] On 15 October 2005, the USMC, through the Naval Air Systems Command, accepted delivery of the first AH-1Z production helicopter to enter the fleet.[17] The AH-1Z and UH-1Y completed their developmental testing in early 2006.[18] During the first quarter of 2006 the aircraft were transferred to the Operational Test Unit at the NAS Patuxent River, where they began operational evaluation (OPEVAL) testing.[19]

In February 2008, the AH-1Z and UH-1Y began the second and final portion of OPEVAL testing.[20] AH-1Z testing was stopped in 2008 due to issues with its targeting systems.[10] The AH-1Z was finally declared combat-ready in September 2010.[21]

Operators

 United States

Potential Operators

  • South Korean Army - On September 21, 2012, the U.S. Congress was notified of the possible purchase of 36 AH-1Z Vipers by South Korea. The order would include 84 engines (72 installed and 12 spares), 288 AGM-114K3 Hellfire missiles, 72 AIM-9M-8 Sidewinder missiles, integrated missiles launchers, targeting systems, and radar jammers. The order would be worth $2.6 billion.[22] The Viper is competing against the AH-64 Apache and the TAI/AgustaWestland T-129 for the order and a decision is expected by the end of 2012.[23]

Specifications (AH-1Z)

Front view of AH-1Z at the MCAS Miramar Air Show

Data from Bell Specifications,[5] The International Directory of Military Aircraft, 2002–2003,[24] Modern Battlefield Warplanes[3]

General characteristics

  • Crew: 2: pilot, co-pilot/gunner (CPG)
  • Capacity: 6,661 lb (3,021 kg)Rotor systems: 4 blades on main rotor, 4 blades on tail rotor

Performance Armament

Avionics

See also

Related development

Aircraft of comparable role, configuration, and era

Related lists

References

  1. ^ 4120-15L, Model Designation of Military Aerospace Vehicles (PDF), USA: DoD, 12 May 2004.
  2. ^ a b Bell AH-1Z page. Bell Helicopter. Retrieved 3 January 2008.
  3. ^ a b c d e f Donald, David. Modern Battlefield Warplanes. AIRTime Publishing, 2004. ISBN 1-880588-76-5.
  4. ^ Bishop, Chris. Huey Cobra Gunships. Osprey Publishing, 2006. ISBN 1-84176-984-3.
  5. ^ a b c d e f Bell AH-1Z Pocket Guide. Bell Helicopter, Retrieved: 16 July 2012.
  6. ^ a b AH-1W/AH-1Z Super Cobra Attack Helicopter, USA. Airforce-Technology.com. Retrieved: 14 January 2008.
  7. ^ "AH-1Z completes first flight". Bell Helicopter, 7 December 2000.
  8. ^ "AH-1Z/UH-1Y complete developmental testing". US Navy, 6 March 2006.
  9. ^ Warwick, Graham. "Bell AH-1Z upgrade to switch to new airframes". Flightglobal.com, 15 February 2008.
  10. ^ a b Trimble, Stephen. "US Navy proposes more UH-1Ys, AH-1Zs despite test phase setback". Flight International, 22 August 2008.
  11. ^ Butler, Amy. "U.S. Marines Propose AH-1Z Production Boost" Aviation Week, 13 October 2010. Retrieved: 13 October 2010.
  12. ^ "Bell Helicopter AH-1Z Earns Navy Recommendation for full Fleet Introduction". Bell Helicopter, 4 October 2010.
  13. ^ "Bell Helicopter AH-1Z earns Navy approval for full rate production". Shephard Group Limited. 10. Retrieved 11 December 2010. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help); Unknown parameter |month= ignored (help)
  14. ^ "Snakes and Rotors: The USMC's H-1 Helicopter Program". Defense Industry Daily. 30 December 2010. Retrieved 2 January 2011.
  15. ^ "From Hueys to Harvest Hawk: Ordnance Marine arms aircraft in Afghanistan" by Cpl. Samantha H. Arrington, DVIDS. 19 May 2011
  16. ^ "AH-1Z/UH-1Y complete first sea trials", US Navy, 13 June 2005.
  17. ^ "Bell 449 SuperCobra and KingCobra"[dead link]. Jane's Information Group, 7 December 2005.
  18. ^ Milliman, John. "AH-1Z/UH-1Y complete developmental testing". US Navy, 1 March 2006.
  19. ^ "AH-1Z/UH-1Y Start OPEVAL". US Navy, 6 May 2006.
  20. ^ Warwick, Graham. "US Marine Corps' Bell AH-1Z and UH-1Y enter final test phase". Flightglobal.com, 20 February 2008.
  21. ^ Trimble, Stephen (30 September 2010). "USMC declares AH-1Z Viper combat ready". Flight International. Retrieved 1 October 2010. {{cite web}}: Italic or bold markup not allowed in: |publisher= (help)
  22. ^ Korea – 36 AH-1Z Cobra Attack Helicopters - Defense-Aerospace.com, September 25, 2012
  23. ^ Korea helicopter bids - Flightglobal.com, September 26, 2012
  24. ^ Frawley, Gerard: The International Directory of Military Aircraft, p. 37. Aerospace Publications Pty Ltd, 2002. ISBN 1-875671-55-2.
  25. ^ AN/APG – Equipment Listing. designation-systems.net
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