Quote Originally Posted by daliad100 View Post
If you keep the mass of the ram and spike down and move it very fast (low moving mass + high flow rate) then you have a chance of stabbing through something.
I think it should be the other way round, the spike should be made from very heavy material like tungsten and be made as small as possible - same principle as used on armour piercing KE rounds. Having said that, I cant see a crosbow launched tethered projectile attaining the velocity of a cannon launched KE penetrator... But still worth a try!