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From: Cryptoengineer <petertrei@gmail.com>
Newsgroups: rec.arts.sf.written,rec.arts.comics.strips
Subject: Re: xkcd: Drafting
Date: Thu, 29 May 2025 12:29:03 -0400
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In-Reply-To: <avlc3kl381srelqf10jbt947ah5vv0r90q@4ax.com>

On 5/27/2025 8:28 PM, Joy Beeson wrote:
> 
> On Fri, 23 May 2025 15:07:00 -0500, Lynn McGuire
> <lynnmcguire5@gmail.com> wrote:
> 
>> xkcd: Drafting
>>      https://www.xkcd.com/3093/
>>
>> No, no, no, that will not work.  But it is cute.
>>
>> Explained at:
>>      https://www.explainxkcd.com/wiki/index.php/3093
> 
> None of the discussions mention that the pulling vehicle
> also gets a boost, because the second one fills in the
> low-pressure volume he leaves behind.

A well designed rocket does not leave a low pressure area
behind it - the exhaust is ideally at the same pressure as
the surrounding atmosphere.

Closely related are 'base-bleed' artillery shells, which
increase range by using a (non-rocket) pryrotechnic to
eject gasses behind the shell, to fill the low pressure
area.

pt