3 areas of concern as seen on the ISS
1) If you go full international everything will take 10 times as long and cost 10 times as much. That does NOT mean you should go isolationist. If the Americans want to drop a lab literally next door, thats OK, even if they want to share power and air thats OK. But you have to be firm about each item being owned and responsible by precisely one nation (or at most a very small group) and you cannot make the whole project or even subprojects depend on that one nation's work. If the Germans want to land a really cool telescope and click it into position next to the base like a lego block, fine. But if you need a full UN treaty to launch some oxygen tanks then you're completely F'd as those guys are utterly ineffective.
2) Permanent as in ongoing perpetual expansion like a stereotypical overseas military base, or permanent as in we've not decided when to abandon ship yet? The danger of not being in perpetual expansion mode is you'll probably end up like the ISS, in construction for 99% of its lifetime and the week after the last bolt is tightened, its time to deorbit and give up. Permanent as in we intend to expand or improve this base to the tune of $1B/yr in perpetuity is a pretty good idea. Project management with a defined yet nebulous end date after which its managerially abandonded is a great idea for making "a" disposable rocket engine. Its a terrible idea for an entire base, or a station, or even a vehicle program.
3) Please don't do the space shuttle and ISS thing of promising everything to everyone for free and instantly, and then scaling back until its a miserable failure compared to its original goals. So the ISS could hold 24 crew. OK, lets build everything to the assumption that the hotel labor load will be 2 people working full time, thats less than 10% of the crew changing air filters and gaskets or unclogging toilets or whatever the hotel load is on a station. Whoops we're imploding the crew size to 6, now a minimum of 1/3 of the on-orbit time is spent maintaining the station. Whoops. Suddenly a station where most of the people do scientific research turns into an aerospace version of "this old house". Whoops.
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