HAWC Torpedo Concept

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American maritime patrol aircraft currently carry torpedoes as part of their armament, which serve as key weapons against enemy submarines. As any high-diver of cliff-jumper knows first hand, however, water can feel surprisingly solid after a long fall. Torpedoes still have to be released from low altitude, typically 100 feet or less above the waves. Two recent developments, however, are making this approach less practical for the US military. One is tests of sub-launched anti-air missile systems, using modified short-range air-air missiles that do not require radar guidance. The other is its selection of the 737-based P-8A Poseidon as its next maritime patrol and surface surveillance aircraft. The P-8A can perform low swoops if necessary, but its airframe is really optimized for cruising at altitude.

As these trends developed, someone in the US military asked the logical next question:

P-3 Over Bermuda 1985

P-3: Bermuda 1985
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“what if we could attach a JDAM-ER style glide kit with GPS guidance to a lightweight torpedo, launch from high altitude, then let the kit maneuver it into attack position and release it near sea level instead? Not only would this fit the P-8A’s strengths, it would also let us reduce airframe fatigue on the old P-3C fleet.”

Enter Lockheed’s Longshot, aka. the High Altitude ASW Weapons Concept (HAAWC).

The LongShot system is a low-cost, self-contained wing adaptor kit that can provide these capabilities to a range of existing air-to-surface munitions, including sea mines, gravity bombs, laser-guided bombs and cluster bomb dispensers. The system is self-contained and includes a flight control computer, a GPS-based navigation system, and power sources; range is up to 50 nautical miles. This makes the LongShot kit a potential competitor to Boeing’s JDAM-ER offerings.

WCMD-ER Longshot GBU-87

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It’s a competitor with a major difference, however. LongShot does not require a MIL-STD-1760 interface, or even an electrical interface with the aircraft. This means LongShot offers instant GPS capability and compatibility to a wide range of aircraft that would not otherwise be capable of launching GPS-guided weapons, without requiring a costly and time-consuming process of re-wiring the aircraft, and/or setting up a weapons interface with its onboard systems. Targeting information can be input via a laptop computer, or through an in-aircraft knee pad device that plugs into the aircraft intercom. The knee pad device establishes two-way communication with LongShot via the aircraft’s UHF radio.

This procedure is an inconvenience to a fighter pilot when compared to fully-integrated weapons, but it works excellently well on aircraft like the P-3C, P-8A, and other bombers or specialty aircraft that have multiple crew and more work space.

Lockheed Martin had already been developing this extended range kit for the WCMD GPS-guided cluster bomb, and leveraged the “Longshot” kit it picked up in the Leigh Aerosystems acquisition as a starting point. The HAAWC wing kit is attached to the torpedo by two metal bands. A device forces open the bands, enabling the wing kit to jettison normally from the torpedo. In actual operation, the wing kit jettisons when the torpedo reaches its normal launch altitude close to the surface of the water. At that point, the torpedo simply performs normally.

Contracts and Key Events

P-8A Over Mountains Concept

P-8A: oncoming
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March 9/21: Phase 1 Lockheed Martin Aeronautics won a $7.8 million deal for the LongShot, Phase 1. The contract provides for the research, development and demonstration of the LongShot unmanned air vehicle (UAV). The LongShot program is developing an air-launched unmanned air vehicle (UAV) with the ability to employ multiple air-to-air weapons. The objective is to develop a novel UAV that can significantly extend engagement ranges, increase mission effectiveness, and reduce the risk to manned aircraft. Work will take place in California and Florida. Estimated completion will be in February 2022.
September 5/19: MK54 MOD 1 Progeny Systems won a $10.7 million modification to exercise Option Year Two for the production of MK54 MOD 1 lightweight torpedo proof of design components, test equipment, associated production support material, spares, and engineering and hardware support services. The MK54 is a standard 324mm torpedo. The MK 54 Mod 1 hardware upgrades the torpedo’s sonar array from 52 to 112 elements, providing higher resolution. Associated software upgrades are designed to exploit these features to improve target detection, enhance false target rejection, and correct previously identified deficiencies. The modification combines purchases for the USN as well as one percent for the government of the UK. Work will take place in Pennsylvania, Utah, and Virginia and is scheduled to be finished by March 2022.
May 22/19: Canada The State Department approved a possible Foreign Military Sale of MK 54 lightweight torpedoes to Canada. The deal is valued at $387 million. Canada had requested to buy 425 MK 54 lightweight torpedo conversion kits. The country intends to upgrade its current MK 46 torpedoes to MK 54 to be used on the Royal Canadian Navy’s Halifax class ships, the Royal Canadian Air Force’s CP-140 Aurora aircraft, and the CH-148 maritime helicopters. The sale also includes torpedo containers, recoverable exercise torpedoes with containers, fleet exercise section and fuel tanks, as well as air launch accessories for fixed wing, torpedo spare parts, training, publications, support and test equipment, US government and contractor engineering, and technical and logistics support services.
January 11/19: Boeing tapped for HAAWC integration on P-8A The US Naval Sea Systems awarded Boeing a $9.3 million contract modification for the integration of the High Altitude Anti-Submarine Warfare Weapon Capability (HAAWC) on the Poseidon P-8A submarine-hunting aircraft. The High Altitude Anti-Submarine Warfare Weapon Capability (HAAWC) provides an all-weather, anti-submarine warfare (ASW) weapon system capable of high altitude launch of the MK-54 torpedo from the P-8A Poseidon. HAAWC consists of a modular, Air Launch Accessory (ALA) kit that attaches to the MK-54 Torpedo. the ALA transforms the MK-54 into a precision-guided glide weapon wich operates in either GPS-aided or GPS-denied environments. Back in June the the US Navy announced, it intended to award Boeing a contract for full rate production of the HAAWC Air Launch Accessory for use in launching the MK 54 Torpedo from the P-8A Poseidon aircraft from high altitude. Work will be performed in Missouri and is expected to be finished by May 2020.

March 30/17: A decision will be made shortly by the US Navy to go ahead with low-rate production of the Lockheed Martin High Altitude Anti-submarine warfare Weapon Capability (HAAWC) package. The package integrates an air-launched accessory (ALA) kit with a GPS guidance system and folding wings onto a standard Mk54 torpedo, and will be made available to P-8A Poseidon foreign customers, which currently include Australia, India and the UK. A guided flight test is scheduled for late Fiscal 2017, and could see as many as 140 high-altitude torpedoes total ordered over the first two lots.

April 27/11: US NAVSEA announces its plans to issue a competitive Request for Proposal (RFP), covering Air Launch Accessory requirements for the the HAAWC precision-guided, high-altitude torpedo kit’s successful integration with both the P-8A Poseidon, and the MK 54 Torpedo.

A Request for Information (RFI) and related attachments was originally slated for May 31/11, but it has been moved back to Sept 30/11. It is the Government’s intent to review Industry comments/questions regarding the RFI prior to the release of any RFP. FBO.gov

May 29/07: Lockheed Martin reports success in a single point concept demonstration conducted at the Atlantic Undersea Test and Evaluation Center (AUTEC) in the Bahamas. A MK-54 HAWC torpedo was launched from the internal weapons bay of a P-3 Orion aircraft flying above 8,000 feet, navigated via GPS into position, then self-jettisoned as the fully functional MK-54 exercise torpedo successfully splashed down. Lockheed Martin release.

Sept 26/06: Lockheed Martin announces successful wind tunnel and wing separation tests of its High Altitude Anti-Submarine Warfare Weapons Concept (HAAWC) system, using the Lockheed Martin LongShot Wing Adapter Kit on the MK-54 torpedo. In the wind tunnel test at the San Diego Air and Space Technology Center’s Low-Speed Wind Tunnel, HAAWC demonstrated expected performance that would enable the torpedo to be launched at cruising speeds, at the maximum desired range from the target.

Lockheed Martin is working under a 7-month, $3 million contract for the U.S. Navy to demonstrate delivery of the MK-54 lightweight torpedo from a P-3C aircraft operating at high altitudes (approximately 20,000 feet).

June 13/06: Lockheed Martin announces a 12-month, $3 million US Navy contract for its High Altitude Anti-Submarine Warfare Weapons Concept (HAAWC). The program will demonstrate delivery of the MK-54 lightweight torpedo from a P-3C aircraft operating at high altitudes (approximately 20,000) feet. The demonstration will include a high-altitude launch, where the HAAWC-equipped torpedo will glide to its normal launch altitude close to the surface, and then jettison the LongShot wings prior to water entry.

March 11/03: Lockheed Martin announces its acquisition of certain assets of Leigh Aerosystems in Carlsbad, CA. Terms of the sale were not disclosed. Privately held Leigh Aerosystems designs, tests and produces the LongShot Wing Kit that can be attached to existing “dumb” bombs to increase accuracy and range.

Lockheed’s release says that the kit will be adapted into Lockheed Martin’s $102 million Wind Corrected Munitions Dispenser, Extended Range (WCMD-ER) program to be used on CBU-87, -89, and -97 dispenser weapons. WCMD-ER is expected to go into production in 2005. The Air Force has requested 7,500 of these systems.

Additional Readings & Sources

Categories: Bombs – Smart, Contracts – Awards, Design Innovations, Lockheed Martin, Mergers & Acquisitions, New Systems Tech, Other Corporation, Testing & Evaluation, Transformation, Underwater Weapons, USA