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- Newsgroups: sci.space
- Path: sparky!uunet!hela.iti.org!aws
- From: aws@iti.org (Allen W. Sherzer)
- Subject: Re: Saving an overweight SSTO....
- Message-ID: <1993Jan12.203315.15073@iti.org>
- Organization: Evil Geniuses for a Better Tomorrow
- References: <1993Jan11.075346.12742@bby.com.au>
- Date: Tue, 12 Jan 1993 20:33:15 GMT
- Lines: 34
-
- In article <1993Jan11.075346.12742@bby.com.au> gnb@baby.bby.com.au (Gregory N. Bond) writes:
-
- >1) It's overweight by some relatively small amount, say, 5000lbs. This
- >leaves 5000lbs payload, still a worthwhile cargo. And the price/lb is
- >double projections, but still a small fraction of ELVs. So the
- >project is still a win, albeit smaller.
-
- The current DC-Y concept has a payload of a bit over 20,000 pounds. In
- addition, there is a design margin of about 15,000 pounds. So in the above
- scenario where the vehicle is 5K pounds overweight the un-used margine
- goes to payload and thus payload goes to 30,000 pounds.
-
- >2) The mass overrun is a substantial fraction of payload, or exceeds
- >payload. Then a possibility would be to delete the life support and
- >crew cockpit and use the thing unmanned....
-
- Note that the 15% margin allows for lots of mistakes. However, if
- it turns out that overruns are too great, the program is still
- a success. We will know EXACTLY what systems must be weight reduced
- to make it work. After a few years of research in those areas, we
- will have a working vehicle.
-
- >And in any case, you know a lot more than when you started, and you
- >can do it right next time!
-
- Or, you continuously improve the DC-Y until it flies.
-
- Allen
-
- --
- +---------------------------------------------------------------------------+
- | Allen W. Sherzer | "A great man is one who does nothing but leaves |
- | aws@iti.org | nothing undone" |
- +----------------------102 DAYS TO FIRST FLIGHT OF DCX----------------------+
-