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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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