X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 09 May 2005 23:32:15 -0400 Message-ID: X-Original-Return-Path: Received: from [64.4.35.178] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 938189 for lml@lancaironline.net; Mon, 09 May 2005 20:59:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.4.35.178; envelope-from=gary21sn@hotmail.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 9 May 2005 17:58:20 -0700 X-Original-Message-ID: Received: from 209.180.233.244 by BAY12-DAV4.phx.gbl with DAV; Tue, 10 May 2005 00:58:20 +0000 X-Originating-IP: [209.180.233.244] X-Originating-Email: [gary21sn@hotmail.com] X-Sender: gary21sn@hotmail.com From: "Gary Edwards" X-Original-To: "Lancair Mailing List" Subject: Re: Fuel Flow Transducer X-Original-Date: Mon, 9 May 2005 17:58:18 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0036_01C554C0.AE6EACF0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Mon, 9 May 2005 17:58:18 -0700 X-OriginalArrivalTime: 10 May 2005 00:58:20.0125 (UTC) FILETIME=[5BA8F0D0:01C554FB] This is a multi-part message in MIME format. ------=_NextPart_000_0036_01C554C0.AE6EACF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable For those of you that have installed your fuel flow transducer upstream of the gascolator, have you found the need to install any sort of fuel filter? I'm using the Floscan 201B )for a RMI uMonitor) and was concerned that any largish chunks that aren't caught by the finger strainers in the header tank, might be large enough to jam the small turbine wheel in the transducer and shut down the flow. I contacted Floscan and couldn't get them to give me any sort of answer on how large a particle the transducer could tolerate. Some of the RV guys have installed fuel filters upstream which have also helped to reduce the pulses from the mechanical pump which had caused some of them to get inaccurate readings. Any of you do this? Thanks. Scott The Floscan fuel transducer on my bird is mounted on the firewall down = stream from the gascolator and boost pump. I use straight fittings both = in and out of the transducer. The transducer is interfaced to a RMI = uMonitor. =20 I get very accurate readings of the fuel flow to actual fuel usage. The = RMI uMonitor is programmable so the user can dial in the actual engine = fuel flow. =20 In my case, I have it dialed in a little high, so I most always have = about .5 to 1 gallon more of fuel actually remaining when dipping the = tanks after a flight. Sort of a little 'peace of mind' that I have at = least the fuel that it shows and maybe a little more remaining. That is = about 1.5% to 3% more flow indicated than is actually occurring. So, at = cruise, when the uMonitor is indicating 8.5 GPH, 8.25 GPH is actually = occurring. All that is close enough for me as there is always some = inaccuracies when dipping 3 tanks. Being off by just a .25 gallon per = tank when dipping; well there is .75 gallon right there. Of the RV's on this field, and there are several, I have not heard of = anyone speak of pulses from the mechanical pump causing inaccurate flow = readings. If there are inaccuracies, it may be they used 90 degree = fittings at the transducer instead of straight fittings. If I recall, = the RMI instructions indicate to use straight fittings in and out to = reduce fuel turbulence. But that is another subject. This post may be a little off of your direct questions, but it is = directed to the point about mounting the fuel transducer up or down = stream from the gascolator. Gary Edwards N21SN 235/320 =20 ------=_NextPart_000_0036_01C554C0.AE6EACF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
For those of you that have installed your fuel = flow
transducer=20 upstream of the gascolator, have you found
the need to install any = sort of=20 fuel filter?  I'm
using the Floscan 201B )for a RMI uMonitor) = and=20 was
concerned that any largish chunks that aren't caught
by the = finger=20 strainers in the header tank, might be
large enough to jam the small = turbine=20 wheel in the
transducer and shut down the flow.  I = contacted
Floscan=20 and couldn't get them to give me any sort of
answer on how large a = particle=20 the transducer could
tolerate.   Some of the RV guys have = installed=20 fuel
filters upstream which have also helped to reduce the
pulses = from the=20 mechanical pump which had caused some
of them to get inaccurate=20 readings.  Any of you do
this?  = Thanks.

Scott
 
The Floscan fuel transducer on my bird is mounted on the firewall = down=20 stream from the gascolator and boost pump.  I use straight fittings = both in=20 and out of the transducer.  The transducer is interfaced to a RMI=20 uMonitor. 
 
I get very accurate readings of the fuel flow to actual fuel = usage. =20 The RMI uMonitor is programmable so the user can dial in the actual = engine fuel=20 flow. 
 
In my case, I have it dialed in a little high, so I most always = have about=20 5 to 1 gallon more of fuel actually remaining when dipping = the tanks=20 after a flight.  Sort of a little 'peace of mind' that I have = at least=20 the fuel that it shows and maybe a little more remaining.  That is = about=20 1.5% to 3% more flow indicated than is actually occurring.  So, at = cruise,=20 when the uMonitor is indicating 8.5 GPH, 8.25 GPH is actually=20 occurring.  All that is close enough for me as there is always some = inaccuracies when dipping 3 tanks.  Being off by just a .25 gallon = per tank=20 when dipping; well there is .75 gallon right there.
 
Of the RV's on this field, and there are several, I have not heard = of=20 anyone speak of pulses from the mechanical pump causing inaccurate flow=20 readings.  If there are inaccuracies, it may be they used 90 degree = fittings at the transducer instead of straight fittings.  If I = recall, the=20 RMI instructions indicate to use straight fittings in and out to reduce = fuel=20 turbulence.  But that is another subject.
 
This post may be a little off of your direct questions, but it is = directed=20 to the point about mounting the fuel transducer up or down stream = from the=20 gascolator.
 
Gary Edwards
N21SN 235/320      

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