Slowest boat to Saturn is a total of ~15.2 kps (yes, it takes just as much to get to freaking Saturn as it does to get out of Earth's atmosphere). Getting there quickly takes a lot more delta-Vee. Once you get into orbit, you're halfway to anywhere, if you can take your time getting there. 11.2kps is escape velocity for earth, but you only need ~7.6kps to get to orbit. That's 6300kg hitting the planet at 10,000kps. In fact, the only explosive charge on most space weapons is probably a 'range safety' like how modern AA rounds detonate when the tracer burns out (to prevent a whole round from coming back down to the ground and damaging what you're attempting to protect).Ħ.3x10^16 joules is 15 megatons, or one Tunguska. At 3km/s, you pack your own weight in bloom. With sufficient speed, you don't need an explosive charge.
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