…System
"As I and others have frequently noted, space is big. Very big. And while it may be the final frontier its exploration is far from an insignificant enterprise. The technological challenges alone are almost unimaginable, and they are dwarfed by even greater challenges in the form of people. People like to spend mont and time in their own, direct and immediate, interests. Although spreading to the stars is, in my own opinion, the best way for humanity to survive in the long run, most people cannot see the need for starships – those in charge, at any rate. Quite aside from the motivation of the people making decisions, the economics of interstellar travel will prevent it for many years to come. Something like the Daedalus starship of the British Interplanetary Society, pictured above, would cost ~$175 trillion dollars. Much of that is research cost, and thus gives back in the long term, but anything spent on the starship itself can never bee recovered. And as much as scientists may argue the value of good data, few politicians would agree with them.
The solution is to utilised a design that will result in, if not profit, a greatly reduced cost. Any large – scale interstellar exploration will need large orbital construction facilities, probably utilise asteroid mining, and even might harvest fuel from gas giants. All in all there will be a lot of infrastructure that needs to be built, adding to the cost. However, anything geared to mining the asteroids can be put to commercial use once the starship has departed, and represents an investment, not a purchase. The trick is to minimise the amount of material and tech that actually leaves the solar system, while maximising the amount of tech that can be later used to develop the solar system at a possible profit.
And for once the universe is playing fair. It turns out that one of the best systems for a small interstellar craft also best fits the other requirements I've described: the beamrider. I talked about beamriders here, so I won't go into too much detail about the specific design. Personally I think that one utilising a e-sail/mag-sail and a plasma based beam would work best. The beam can provide more momentum for the same amount of power as a laser, so it gives greater acceleration, countering its short range. Also, the e-sail and magsail are both very effective at decelerating from high speed, so they can be used at the destination. Another advantage is that it would be harder to use the plasma beam as a weapon, due to a range smaller than hat of a laser, and inability to penetrate Earth's atmosphere, which makes it more likely that governments would allow it to be built…"
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