Air Weapons: Hogs And Harriers Go 70mm


January 17, 2010: After more than a decade of development effort, by several different companies, there now several guided versions of the 70mm air-to-ground rocket. Now the U.S. Navy is buying fifty AKWS II (Advanced Precision Kill Weapons System) 70mm missiles, to test on Marine Corps AV-8 (Harrier) vertical takeoff aircraft, and U.S. Air Force A-10 (Warthog) ground attack aircraft. The AV-8 has previously used unguided 70mm rockets, but the A-10 has not.

Developing a guided 70mm rocket took so long because the manufacturers underestimated the technical difficulties of getting the laser seeker and flight control mechanisms into that small a package, at a weight and price the customer could afford. The price of the new DAGR 70mm missile is about $20,000 each (about a third less than a smart bomb, and much less than a Hellfire missile). The developer of the competing APKWS, BAE, believed it was close to perfecting APKWS, but Congress ran out of patience and money for it two years ago. The marines took over APKWS development, completed it and got the navy to try it out.

The guided 70mm rocker is to be used against targets that don't require a larger (hundred pound), and more expensive (over $100,000) Hellfire missile, but still need some targeting precision. In tests, the APKWS hit within a few feet of the aiming point, and the DAGR and APKWS are just as accurate. The 70mm missile makes an excellent weapon for UAVs, especially since you can carry four of them in place of one Hellfire. The launcher for these missiles is built to replace the one for Hellfire, but carry four missiles.

The most recent 70mm missile to arrive on the scene is from Lockheed-Martin, which recently completed twelve out of twelve successful tests of their DAGR 70mm guided rocket. DAGR was declared ready for service in 2008, but the U.S. Department of Defense didn't respond with any orders.

The DAGR would appear to be an ideal weapon, as it also uses the Hellfire fire control system. Lockheed-Martin developed DAGR with their own money. Two years ago, the U.S. Army cancelled work on a similar effort, APKWS. Both are basically a 30 pound 70mm rocket, with a laser seeker, a six pound warhead and a range of about six kilometers. Laser designators on a helicopter, or with troops on the ground, are pointed at the target, and the laser seeker in the front of the DAGR homes on the reflected laser light.

The 2.75 inch (70mm) rockets were developed during World War II as an air-to-air weapon for use against heavy bomber formations. The Germans had developed a similar, and very successful weapon (the R4M), but before long it was noted that neither the Japanese nor the Germans had any heavy bombers, so the U.S. 70mm rocket was switched to air-to-ground use. Actually, the 70mm rocket was retained for air-to-air use into the 1950s, but it was never successful in that role. The 70mm rocket became very popular in the 1960s, when it was discovered that the weapon worked very well when launched from multiple (7 or 19 tube) launchers mounted on helicopters. The 42-55 inch long rockets could be fired singly or in salvoes, and gave helicopter pilots some airborne artillery for supporting troops on the ground. There are many variations in terms of warheads and rocket motors. Some versions can go over 10 kilometers.

Apparently the orders for 70mm guided missiles have not been forthcoming because the Hellfire is doing the job and there just isn't a big demand for a smaller missile. But the marines believe that a mini-Hellfire, in the form of their APKWS II, has a role on the battlefield. Testing the weapon on the A-10 is an effort to get the air force convinced as well. The marines are also testing APKWS II on their helicopter gunships, in an effort to get the army interested. Actually, the army is already interested, and if the marines can succeed in getting the Department of Defense to allow them to order it for combat use, the army will probably follow.





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