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Re: starship-design: Inter-planetary craft
> No. You need to define the amount of cargo to be launched. If you want to
> launch a hand full of components like the ISS space station, you probably
> could support a launcher system much below $2000 a Kilo. You want to build
> and operat a space hotel like in 2001. You could probably get well below
> $100 a kilo.
Daily for 500 kg craft:
5 people ( manned craft )-- 500 kg 1 launch
1,500 kg ( unmanned ) cargo/bulk fuel. 3 launches
> 25 watts per isp is nonsence. ISP would vary wildly with the type of rocket
> and the reacti mass its using.
This a ball park figure for 100% efficient reaction engine from a
energy stand point.
> Same reason fighter planes need hours of servicing between flights. Higher
> performance, higher stress systems pushed closer to limits. More complex
> systems. It'll be a while before we can make something with margins so thick
> you can take such chances.
> Oh, but you NEVER just fuel and fly a small plane. You always spend some
> time doing sheck out on it. And every so often its taken to a machanich to
> tear down andrebuild and inspect.
I don't say there will be no down time, but that is why you have
aircraft ready for flight.
> >I want to build a small complex with say 75 people in a habitat, not
> >the empire state building.(25 rooms).
> You couldn't possibly afford it, or support it. A bigger platform you could.
I just need to find 74 more people with the same interest.
The bigger platform is cheaper makes no sense to me.
> Your small platforms would need to wait until after soimeone built the big
> ones. Also you need a platform big enough to spin for full gravity.
This would about 2x the size of apartment building I liven,
room for gardens and pets and play areas.
> >Guessing that CH4/O2 costs about the same as O2 / kerosene ( $35/kg )
> >we need to pick a realistic figure for costs.
> Wait a minutte. Liquid O2 costs about $0.05 a pound and I think kerosines
> $0.25 a pound? Where do you get $35 a kilo?
That is fuel and base costs to place 1 kg in orbit.
With about a 40:1 ratio for just fuel $11.20
O2 is $.8 and $.20 for kerosene 1980 for 1 kg.
I have no idea the price of CH4 so I am guessing here it is the same.
liquid hydrogen is $3.80 for 1980 prices.
"We do not inherit our time on this planet from our parents...
We borrow it from our children."
The Lagging edge of technology: