From: RWolf99@aol.com
Message-ID: <89.c5e05b3.28ded056@aol.com>
Date: Sun, 23 Sep 2001 01:42:46 EDT
Subject: Re: 6' fuel probes
To: lancair.list@olsusa.com
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Reply-To: lancair.list@olsusa.com

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In a message dated 9/22/2001 10:11:25 PM Pacific Daylight Time, 
lancair.list@olsusa.com writes:

<< the gas pressure on top of the liquid on both sides must be EXACTLY the 
same if the levels are to be the same >>

The comment refers to using a short vertical standpipe at the wing root to 
house a capacitance fuel probe.  The above coment is correct, but the problem 
is rectified by simply drilling a hole at the top of the standpipe.  The 
standpipe is essentially a tube that is open to the fuel at the bottom, and 
open to the fuel vapor ("Ullage", as we in the rocket biz call it) at the 
top.  If you look closely at any capacitance probe, you should see such a 
vent hole.  They have to vent, too, for the liquid level between the coaxial 
tubes to match that outside the tubes.

- Rob Wolf
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Please send your photos and drawings to marvkaye@olsusa.com.
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