Whoa, back on track, please! Let's drag this back into a role-playing system, ok? The discussions so far are interesting and, it seems to me, productive.
In my mind there are three main practicalities to consider, and they've all been touched on so far:
(1) Drakon brought up the beanstalk. ASSUME we can get into orbit cheaply by 2020. Who was it that said once you're in orbit, you're halfway to everywhere [in the solar system]?
(2) Maneuver drive technology has to develop a bit, to support continuous, long-term acceleration of 0.01 G or more (or is that 0.1 G?).
(3) Tom brought up colony-building effort. What we need is some possible colony locations, their purpose, what their initial productive size should be, and how fast they'll grow.
My Starting Assumptions
Your assumptions will help me refine my assumptions, of course.
Assumption #1. A beanstalk is feasible and cheap with a 2020 target. Thus, we can lift payloads to orbit with price efficiency.
Assumption #2. Maneuver drive may reach 0.01 G by 2020, via breakthrough or steady improvement. I don't really know much about the current state of propulsion, so I'm guessing. But in order to really exploit the solar system, we ought to have this kind of acceleration. And of course human colonies depend on travelling weeks or months, not years.
Assumption #3. If exploitation of the solar system can be market-driven, then I suppose the first targets will be:
a. the moon and/or trojan points
b. the belt
Orbital Starport
A maintenance center or drydock of sorts will go up in Earth orbit to service and even build parts of corporate ships -- if anything's cheaper than building it on the surface and shipping it up. This primitive orbital facility will also service corporate prospecting ships, designed to look for mineral resources. Perhaps an orbital refinery might be useful for processing ores from the Belt, if/when the Belt begins to be colonized.
The initial orbital drydock will probably take ten years to build -- say 2030. Nice round number. By 2040 an ore refinery and shipyard could be up and running.
More Beanstalks
Additional beanstalk(s) may start to go up after 2020 if demand is there. Perhaps they would each take 10 years to build.
Corporate Prospector Ships
Corporations interested in looking for mineral wealth in the Belts will first send prospecting ships. Will they be sent in groups, not unlike a Battle Rider concept, with ten 'buggies' attached to a central propulsion ship?
The 'buggies' may each be around 50 tons, and the central 'drive spine' they deploy from could be 500 tons. Any opinions?
The initial prospecting for locating colony sites may take up to ten more years, so the first colonies would be launched between 2030 and 2040.
I suppose there will be 2d6 companies with the desire and ability to do this kind of prospecting and colony building. I'll say '8', but I really mean 2d6, although I really mean 'whatever the referee wants'.
Corporate Belter Colonies
If there's economic interest in developing the Belts, then there will be corporate Belter colonies. Corporate ships to the Belt will be optimized for the size of the belter colony: shipping goods to the colony, and shipping raw ores back to Earth orbit. Corporate interests may have to plan initial colonies carefully, sizing them, shipping the materials there ahead of time, and bringing the colonists up to speed relatively quickly.
Belter colonies, I suppose, may be serviced by monthly cargoliners. What's a small but useful mining colony size? What were the sizes of mining towns in the 1800s? It appears that boom towns had a few thousand, and a lucky few had over 20,000. Can we assume a Belter colony could start with have 2500 colonists? So then, the ship or ships sending the colonists will together accomodate 2500 'passengers' in modules which will probably detach upon arrival, and when ores are produced, cargo modules will be built (probably from prefab material in an extra ship) and attached to the same ship for return to Earth orbit.
If one assumes (wild guess) eight companies with the desire and ability to launch colonies, then by 2040 there'd be perhaps 8 colonies of about 2500 people each in the Belts: 20,000 people total. I imagine this is a very expensive undertaking.
Colony Growth
Wild Assumption: due to the amount of mineral wealth in the Belt (?), colony growth is, for awhile, only restricted to how many people a company wants to send out there.
If the first decade sees 20,000 people sent, the next decade could well see double that. A useful rule might be: for each decade, roll 2d6. If the number is greater than the population 'digit' for the belts, then add 1d6 to the population multiplier; otherwise, leave it be for the moment, and prorate it when the next growth spurt happens, or something like that. So a possible population growth pattern would be:
</font><blockquote>code:</font><hr /><pre style="font-size:x-small; font-family: monospace;">Year 2d6 Population Digit/Mult
2040 - 20,000 4 2
2050 4 35,000* 4 3
2060 9 50,000 4 5
2070 4 80,000* 4 8
2080 7 110,000 5 1
2090 9 700,000 5 7
2100 7 1,300,000 6 1
* Interpolated ex post facto</pre>[/QUOTE]You'll see the population growth starts slow but picks up in the middle, and ought to stop when it gets within 10% of the mainworld population (Earth).
Over time, population distribution will probably spread out to be similar to that of Earth: a few big cities and a bunch of towns and villages. Probably the big cities will follow a ratio: N, N/2, N/3, N/4, and so on, where N is the size of the biggest city (colony).