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Both the AT-4 and the RPG use a shaped charge to penetrate the target. The rounds are both free-flight, fin-stabilized, rocket-type.
Both use a Point Initiated-Base Detonated firing system for the warhead.
The molten liner is detonated from the rear by the noze located fuse upon contact with a hard surface and "burns" through the target with a penetrator it is reformed into, known as and looking somewhat like a carrot.
The shaped charge function is technically referred to as the Monroe effect.
Penetration and diameter of the penetration is a factor of liner depth, angle, and composition, compounded by optimization for the desired target.
Most U.S. shaped charges designed for armor penetration use a copper liner or other metal. Many of the preformed shaped charges (like the 15 and 40 lb. Shaped Charges) for breaching earth or concrete use a glass liner.
The main difference between the two weapons is whether you want a re-usable launcher and the different features of each. Both are equally effective. IMHO, the AT-4 is a repackaged 84mm Carl Gustav round into a disposable, single-shot system.
TR
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"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat." - President Theodore Roosevelt, 1910
De Oppresso Liber 01/20/2025
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