A 23lb(10.4kg) scramjet tank projectile(as discussed above) with a sustained flight speed of Mach 7 as mentioned in the articles above would release 29.6Mj of kinetic energy on impact to a range of approx 5 miles.
In comparison, the current US M829A3 APFSDSDU delivers 'just' 1.7Mj of energy at the muzzle, and that KE drops off with range as drag slows the penetrator. By 4000 meters the M829A3 produces about 40% less KE than at the muzzle. A Scramjet powered tank round will actually get more powerful as it accelerates downrange.
The Army goal of a 23lb penetrator at Mach 7 will produce ]more than 17x greater energy than the muzzle energy of the best US/NATO 120mm APFSDS rounds.
Scramjet powered artillery and naval rounds also show great promise for extending range, massively increasing velocity, and enhancing lethality over current HE rounds. The US Army and USN are both pursuing that technology.
Just to stir the pot a l'il, a scramjet powered sabot round for the Mk7/16" gun that weighed in at 200kg and had an impact velocity of Mach 10 would release almost 1.2 gigajoules of energy. Now imagine that using the new US Army GPS fuzes that demonstrated a 50m CEP.
1.2 gigajoules...lol, boom.
I wonder what kind of lethal radius that would relate too. Make a hell of a big hole in the ground, that's for sure...
Must...have...16"...scramjets...and ships to fire them... :(
Coupled with these GPS guided fuzes: http://forum.a-10.org/topic.asp?TOPIC_ID=9256 , GPS guided scramjet powered shells and missiles show the promise to utterly 'transform' US combat power(air, naval, indirect, and direct).