Mailing List lml@lancaironline.net Message #54133
From: Colyn Case at earthlink <colyncase@earthlink.net>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] Re: Fuel Planning - Capacitance probes
Date: Wed, 06 Jan 2010 16:15:37 -0500
To: <lml@lancaironline.net>
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Gary, if I can add on to Mike's question...
 
I missed what happens if you have part of the probe in water.   
e.g. if the probe goes through the sump and the sump has some water in it.
 
Colyn
 
----- Original Message -----
From: mikeeasley
Sent: Wednesday, January 06, 2010 9:51 AM
Subject: [LML] Re: Fuel Planning - Capacitance probes

Gary,
 
Since the capacitance probes seem to be fairly reliable in our small sampling, but the potential for inaccuracies is there, I'm curious about a couple things.
 
If we calibrate our probes with the engine off, at ~12V in my airplane, how would the fuel level readings change in flight with ~13.8V in the electrical system?
 
How much does temperature effect the fuel level readings?  Say from 30F to 80F.
 
Also, I did some digging on water being dissolved in 100LL.  It appears that they have an additive that causes dissolved water to separate from the fuel and collect at the bottom of the storage container (at any step along the way including our wing tanks).  I hate to use the word "practical" when talking to an engineer, but from a practical sense how much water can we have dissolved in our 100LL?  And is this a bigger problem for the turbine guys?
 
 
 
Mike Easley
Colorado Springs
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