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- Newsgroups: alt.pagan
- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!hp-cv!hp-pcd!hpcvaac!billn
- From: billn@hpcvaac.cv.hp.com (bill nelson)
- Subject: Re: Space, the final frontier
- Message-ID: <1993Jan2.072222.6330@hpcvaac.cv.hp.com>
- Organization: Hewlett-Packard Company, Corvallis, Oregon USA
- References: <gate.5kXmwB1w165w@pil.UUCP>
- Date: Sat, 2 Jan 1993 07:22:22 GMT
- Lines: 29
-
- alizard@pil writes:
- :
- : If these alleged rocket scientists have NUMBERS that demostrate that scaling
- : railguns up to the 1 metric ton range with output velocities in the 5
- : mi/second range are impossible,
-
- There would be little problem, in space. It cannot be done here on Earth,
- due to atmospheric drag.
-
- : if they can demonstrate that scaling laser
- : technology up to the power ranges (10E9 joule) range for laser catapults, or
-
- They probably generate such power, for microseconds at a time. The problem is
- that the power conversion is no 100% efficient. A 99% efficient conversion,
- for a 1000 million watt laser, would mean that you had to dissipate about
- 10 million watts of power. We currently have no way of doing so - for any
- reasonable length of time. Unfortunately, the energy conversion does not even
- approach 99%.
-
- : they can prove that beamed power in the GWatt range is impossible, I'm
-
- Now, this is possible, given a large enough receiving grid to reduce the
- power density to a manageable level.
-
- Note that the problems I listed are due to simple physical laws. It is
- possible that solutions will be found. However, it is going to take a lot
- more than simply scaling up our current technology.
-
- Bill
-