Account Options

  1. Sign in
The old Google Groups will be going away soon, but your browser is incompatible with the new version.
Google Groups Home
« Groups Home
rec.arts.sf.science
+ new post
About this group
Subscribe to this group
This is a Usenet group - learn more
Message from discussion Slow Re-entry
The group you are posting to is a Usenet group. Messages posted to this group will make your email address visible to anyone on the Internet.
Your reply message has not been sent.
Your post was successful
 
From:
To:
Cc:
Followup To:
Add Cc | Add Followup-to | Edit Subject
Subject:
Validation:
For verification purposes please type the characters you see in the picture below or the numbers you hear by clicking the accessibility icon. Listen and type the numbers you hear
 
Hop David  
View profile  
 More options Aug 18 2005, 1:21 pm
Newsgroups: rec.arts.sf.science
From: Hop David <hopspageHATESSPAa...@tabletoptelephone.com>
Date: Thu, 18 Aug 2005 10:21:56 -0700
Local: Thurs, Aug 18 2005 1:21 pm
Subject: Re: Slow Re-entry
Print | View thread | Show original | Report this message | Find messages by this author

Bryan Derksen wrote:
> On Wed, 17 Aug 2005 23:12:40 -0500, Michael Ash <m...@mikeash.com>
> wrote:

>>Hop David <hopspageHATESSPAa...@tabletoptelephone.com> wrote:

>>>By the time you rebuild the bottom 200 kilometers, the beanstalk would
>>>no longer be hovering above the anchor point.

>>The beanstalk would no longer be hovering above the anchor point if it's
>>just a dumb object in orbit. With active control, it could be hovering
>>wherever you want, within the limits of its fuel reserves. Given that the
>>mere existence of a beanstalk means putting massive fuel reserves on it
>>becomes really cheap, I would think this would not be a problem.

> The beanstalk's center of mass could be moved to geosynchronous by
> dropping some pieces of the counterweight, to be replaced once the
> cable's been moved back into position and anchored again. That'd make
> it a lot easier to maneuver.

Seems to me a good way of doing it.

If the far end of the beanstalk is 78000 km from earth's center, it's
velocity would be about 5.7 km/sec, well above the 3.2 km/sec escape
velocity at that altitude. The piece you let go of would be lost forever.

But that would be a worthwhile sacrifice to salvage the entire beanstalk.

--
Hop David
http://clowder.net/hop/index.html


 
You must Sign in before you can post messages.
To post a message you must first join this group.
Please update your nickname on the subscription settings page before posting.
You do not have the permission required to post.
Create a group - Google Groups - Google Home - Terms of Service - Privacy Policy
©2013 Google