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- Newsgroups: sci.space
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!princeton!csservices!atomic!ida
- From: ida@atomic (David Goldschmidt)
- Subject: Re: russian solar sail?+
- Message-ID: <ida.726295295@atomic>
- Sender: news@csservices.Princeton.EDU (USENET News System)
- Organization: Princeton University, Dept. of Computer Science
- References: <1993Jan1.181236.1@acad3.alaska.edu> <2m6RwB2w165w@inqmind.bison.mb.ca> <ewright.726175598@convex.convex.com>
- Date: 6 Jan 93 04:41:35 GMT
- Lines: 20
-
- There is a race being planned by the World Space Foundation (Federation?)
- from geosynchronous orbit to the moon. (At least it was planned as of
- November.) They were hoping to get it off by 1995. As of November they had
- 3 entrants, I think the French, the Japanese, and the WSF itself. The
- Russians were trying to get together a team.
- I expect that there are financial problems, but I don't know for certain.
- I have seen pictures of a sail the WSF actually built; it looked like it was
- about 50 meters on a side. It was a square design, which surprised me; the
- heliogyro design, developed by R. H. Macneal (at JPL?) has several advantages,
- including stability (its spinning), and ease of deployment. The design looks
- something like a helicopter rotor, with long narrow blades that can be pitched
- about their lengthwise axis for control. Heliogyros are also lighter per area
- than sails that have to be rigidized by mechanical means.
-
- It's true that solar sails don't function very efficiently in planetary
- orbits, but there are some benefits for having the first real trial with them
- close to home. Most notably, if anything goes wrong there won't be much of
- a control delay due to speed of light transmission.
-
- Dave Patterson, guest on this account
-