X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 06 Jan 2010 16:15:37 -0500 Message-ID: X-Original-Return-Path: Received: from elasmtp-mealy.atl.sa.earthlink.net ([209.86.89.69] verified) by logan.com (CommuniGate Pro SMTP 5.3.0) with ESMTP id 4066800 for lml@lancaironline.net; Wed, 06 Jan 2010 11:15:34 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.69; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=LJct3QTV2h5N3iPZEsL2wQvWpKWGNOc6DJTp7vNWen9esXVlmqBtiZvKRNIsIB97; h=Received:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [216.57.118.33] (helo=ccaselt3) by elasmtp-mealy.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1NSYXC-0006V3-Mq for lml@lancaironline.net; Wed, 06 Jan 2010 11:14:58 -0500 X-Original-Message-ID: From: "Colyn Case at earthlink" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Fuel Planning - Capacitance probes X-Original-Date: Wed, 6 Jan 2010 11:14:57 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_04E1_01CA8EC1.7B100440" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da9402cf1472977bccb2f1228188e1bfac48d350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 216.57.118.33 This is a multi-part message in MIME format. ------=_NextPart_000_04E1_01CA8EC1.7B100440 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Gary, if I can add on to Mike's question... I missed what happens if you have part of the probe in water. =20 e.g. if the probe goes through the sump and the sump has some water in = it. Colyn ----- Original Message -----=20 From: mikeeasley=20 To: lml@lancaironline.net=20 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? http://chevronglobalaviation.com/docs/aviation_tech_review.pdf = http://www.gewater.com/industries/refining_fuel/fuel_additives/dehazers.j= sp Mike Easley Colorado Springs ------=_NextPart_000_04E1_01CA8EC1.7B100440 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Gary, if I can add on to Mike's=20 question...
 
I missed what happens if you have part = of the probe=20 in water.   
e.g. if the probe goes through the sump = and the=20 sump has some water in it.
 
Colyn
 
----- Original Message -----
From:=20 mikeeasley=20
Sent: Wednesday, January 06, = 2010 9:51=20 AM
Subject: [LML] Re: Fuel = Planning -=20 Capacitance probes

Gary,
 
Since the capacitance probes seem to = be fairly=20 reliable in our small sampling, but the potential for=20 inaccuracies is there, I'm curious about a couple = things.
 
If we calibrate our probes with the = engine off,=20 at ~12V in my airplane, how would the fuel level readings change in = flight=20 with ~13.8V in the electrical system?
 
How much does temperature effect the = fuel level=20 readings?  Say from 30F to 80F.
 
Also, I did some digging on water = being dissolved=20 in 100LL.  It appears that they have an additive that causes = dissolved=20 water to separate from the fuel and collect at the bottom of the = storage=20 container (at any step along the way including our wing tanks).  = I hate=20 to use the word "practical" when talking to an engineer, but from a = practical=20 sense how much water can we have dissolved in our 100LL?  And is = this a=20 bigger problem for the turbine guys?
 
h= ttp://chevronglobalaviation.com/docs/aviation_tech_review.pdf<= /DIV>
 
http://www.gewater.com/industries/refining_fuel/fuel_additive= s/dehazers.jsp
 
Mike Easley
Colorado Springs
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