[AR] Re: Way off topic (was Nitrating C60)

  • From: Jim Davis <jimdavis2@xxxxxxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Mon, 16 Mar 2015 07:22:52 -0500

Keith,
1. You seem to be deliberately avoiding the term specific impulse in favor of exhaust velocity. Any particular reason for that?
2. Am I reading that graph on page 2 correctly? If Skylon makes "only" a 100 flights per year the cost to LEO is over $5000/kg? 

Thanks,
Jim Davis


On 3/14/2015 3:56 AM, Keith Henson wrote:

As some of you know, I have been working off and on for forty years on
getting the cost to GEO down to where power satellites can undercut
coal.

Currently working on a thermal power satellite design that looks to
come in at 32,500 tons and puts out 5 GWe at the rectenna bus bars.

To undercut coal, the total cost can't exceed $2.4 B/GW.  For 6.5
kg/kW, the cost to get the parts to GEO can't exceed $200/kg.  Between
Skylon at more than 10,000 flights per year and an old proposal by
William Brown, it looks like that can be done.

It's here http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7046244
for those who can get through the pay wall.  If not, there is a copy
here:

https://drive.google.com/file/d/0B5iotdmmTJQsc2htUG5yVTczT2xBME1GOGhzWlBaWkg5R29v/view?usp=sharing

Off topic, but some of you may find it amusing.

Keith



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