Thanks,
4- I would guess that it could be drop the rod vertical for penetration and flat for "splash damage".
Interesting considerations I wouldn't have thought up.
Whenever I hear an article "the military developed...." I just assume that they are being deployed for potential use at least somewhere.
Pretty much. It's like hitting a sand castle vertically with a mallet to collapse it vs at an angle to throw sand everywhere...just at 22,000mph rather than 22mph.
The only reason it never made it off the drawing board is high cost, niche use.
If you want a well known example from fiction, read Heinlein's "The Moon Is A Harsh Mistress". It was improvised in that case, but the principle was essentially the same.
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