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Re: starship-design: stale mail
Your mail to: "Michael K. Heney" <email@example.com>
> with subject: Re: Virtual Beanstalk -- Numbers, numbers, who's got the
> sent on: Sun, 08 Aug 1999 21:42:13 -0600 is being returned to you.
> It sat unread in the mailbox beyond NetZero's 6 month limit.
> Undelivered Ideas
> > > Sorry for saying you were negative. I know you were just trying to
> > > put a practical spin on my $10 orbital goal and that you want cheap
> > > access to space as much as I do.
> Here are some round about numbers for my view on the lowest cost.
> http://www.rotaryrocket.com/tec/rotonv.html Rotory rocket.
> Mass fully loaded 180,000 kg
> Pay load 3,200 kg
> cost per playload $2,200 kg
> fuel/payload 56:1
> lox/Kerosene ratio 2.5
> 40 kg lox
> 16 kg fuel for each kq of payload.
> cost 1980 lox kg $ .08
> fuel kg $ .20
> assuming 3 x increase for 2010 then ( my guess )
> lox .24
> fuel .60
> lox $9.60
> fuel $9.60
> rounding up $19.20 per kg of payload fuel costs.
> tricky part assume a running cost 30% of the fuel
> Mininum cost $ 25 per kg $12.5 per lbm
> RLV Current cost $2,200 per kg
> Mature cost ( guess ) $ 50 per kg $25.00 per lbm
> So here are my numbers. I can see why NASA and the military have never
> developed RLV's look how much you can rip off the tax payer.
The big issue is the service costs. Shuttles fuel costs are only tens of dollars a LB, but the real costs are thousands per. The big thing needed is improving the servicability and amount of trafic.
Oh as a nit, fuel and LOx costs have been droping, not rising, for years.
No idea why this sat in a server for months.