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6 juillet 2015 1 06 /07 /juillet /2015 11:20
photo USAF

photo USAF

 

June 27, 2015: Strategy Page

 

The U.S. Air Force recently ordered another few hundred Griffin missiles for use in its AC-130 gunships and UAVs. Entering service in 2010 the AGM-176 Griffin, which weighs 15 KG (33 pounds, or 20.5 kg/45 pounds with the launch tube) and has a 5.9 kg (13 pound) warhead, was first used in Afghanistan. Griffin has a greater range (20 kilometers from aircraft for the B and C versions) than Hellfire because of pop-out wings that allow it to glide after launch. The latest version (Griffin C) uses laser, GPS, inertial guidance and two way communications. The Hellfire II missile has been around a lot longer, weigh 48.2 kg (106 pounds), carries a 9 kg (20 pound) warhead, and have a range of 8,000 meters. But for precision work, as gunships and UAVs are often called on to do, smaller warheads and cheaper missiles are preferred.

 

The U.S. Army also tested the Griffin B missile as a replacement for the more expensive Javelin ATGM (Anti-Tank Guided Missile). In Afghanistan troops at remote outposts use the Javelin as their own artillery, which is especially useful if they are out of range of American 155mm guns and so far from air bases that bombers or helicopter gunships would take a while to arrive. Javelin gets the job done but it is expensive ($75,000 per missile). Griffin is smaller, simpler, and dispenses with the expensive armor-piercing warhead. This is a much cheaper alternative to Javelin. The Griffin B is being tested in a six missile launcher that can be swiveled towards the target and missiles can be quickly fired at nearby threats. Budget reductions put this project on hold although the U.S. Navy also considered using a similar system on ships to take care of Iranian suicide boats.

 

The air force and marines find Griffin excellent for use from gunships, enabling (in addition to the larger Hellfire) gunships to operate in daytime. Previous to the introduction of these precision missiles the gunships had to be low enough to use 20mm and 40mm autocannon. But that brought them within range of similar weapons on the ground plus heavy machine-guns and portable missiles. With Griffin and Hellfire the gunships can fly high enough to be safe from ground fire.

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17 juillet 2012 2 17 /07 /juillet /2012 17:30

GAU-23-30mm-Mk44-Bushmaster-automatic-cannon-ac-130.jpg

 

July 17, 2012: Strategy Page

 

The U.S. Air Force has officially accepted the modified 30mm Mk44 Bushmaster automatic cannon as the GAU-23. For the last three years, modified (and continually tweaked) Mk44s have been operating on a dozen U.S. Air Force AC-130 gunships and, more recently as part of the U.S. Marine Corps Harvest Hawk ("instant gunship" via several pallets of sensors and weapons) version of the KC-130J tanker.

 

The 30mm Bushmaster cannon weighs 157 kg (344 pounds) and fires at 200 or 400 rounds per minute (up to 7 per second). The Bushmaster has 160 rounds available, before needing a reload. That means the gunner has 25-50 seconds worth of ammo, depending on rate of fire used. Each 30mm high explosive/incendiary round weighs about 714 g (25 ounces, depending on type.) The fire control system and night vision sensors, enables the 30mm gunners to accurately hit targets with high explosive shells. Earlier SOCOM AC-130 gunships are armed with a 105mm howitzer, a 25mm and 40mm automatic cannon. But the two smaller caliber guns are being phased out of military service. The air force is now equipping its gunships just with smart bombs and missiles as well as one or two GAU-23s.

 

The big thing with gunships is their sensors, not their weapons. Operating at night, the gunships can see what is going on below, in great detail. Using onboard weapons, gunships can immediately engage targets. But with the appearance of smart bombs (GPS and laser guided), aerial weapons are now capable of taking out just about any target. So gunships can hit targets that were "time sensitive" (had to be hit before they got away), but could also call on smart bombs or laser guided missiles for targets that weren't going anywhere right away. Most of what gunships do in Afghanistan is look for roadside bombs, or the guys who plant them. These gunships want to track back to their base, and then take out an entire roadside bomb operation.

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