Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Wed, 29 Dec 2004 19:06:06 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d21.mx.aol.com ([205.188.144.207] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 583644 for lml@lancaironline.net; Wed, 29 Dec 2004 18:53:11 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.207; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d21.mx.aol.com (mail_out_v37_r3.8.) id q.15d.47221e13 (4410) for ; Wed, 29 Dec 2004 18:52:39 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <15d.47221e13.2f049d47@aol.com> X-Original-Date: Wed, 29 Dec 2004 18:52:39 EST Subject: Re: [LML] Fuel flow measurement X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1104364359" X-Mailer: 9.0 Security Edition for Windows sub 5000 -------------------------------1104364359 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 12/29/2004 5:29:53 P.M. Central Standard Time, Tubamanflies@aol.com writes: Measuring fuel flow and the low rates we use in out Lancairs is difficult at best. The systems that I have looked at that put the flow sensor between the throttle body and the spider are just pressure sensors. Ray, All VM system fuel flow sensors use a turbine (same as JPI, etc.), just like the water wheel in your local grist mill down in the historic district. If installed properly, it is extremely accurate - assuming the gas pump's gauge used when topping my plane are accurate - I might be off by .3 gallon in 30 gallons. Since the FF is used to calculate remaining fuel (not the highly accurate fuel probe information), 1% ain't bad. That is accurate enough for me and always in the right direction - VM says I used more fuel than I actually did. Scott Krueger AKA Grayhawk Lancair N92EX IO320 Aurora, IL (KARR) -------------------------------1104364359 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 12/29/2004 5:29:53 P.M. Central Standard Time,=20 Tubamanflies@aol.com writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Measuring fuel flow and the low rates we use in out=20 Lancairs is difficult at best.  The systems that I have looked at tha= t=20 put the flow sensor between the throttle body and the spider are just pres= sure=20 sensors. 
Ray,
 
All VM system fuel flow sensors use a turbine (same as JPI,=20 etc.), just like the water wheel in your local grist mill down in=20= the=20 historic district.  If installed properly, it is extremely accurate -=20 assuming the gas pump's gauge used when topping my plane are accurate - = ;I=20 might be off by .3 gallon in 30 gallons.  Since the FF is used to=20 calculate remaining fuel (not the highly accurate fuel probe=20 information), 1% ain't bad.  That is accurate enough for me and al= ways=20 in the right direction - VM says I used more fuel than I actually did.
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 Aurora, IL=20 (KARR)

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