Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Thu, 03 Mar 2005 14:34:52 -0500 Message-ID: X-Original-Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 768505 for lml@lancaironline.net; Thu, 03 Mar 2005 12:00:38 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.103; envelope-from=hapgoodm94@alum.darden.edu Received: from HP780N (cpe-065-184-084-150.nc.rr.com [65.184.84.150]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j23GxnCi006360 for ; Thu, 3 Mar 2005 11:59:51 -0500 (EST) From: "Matt Hapgood" X-Original-To: "Lancair Mailing List" Subject: FADEC Rough idle explanation X-Original-Date: Thu, 3 Mar 2005 11:59:51 -0500 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0037_01C51FE8.816068A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-reply-to: X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0037_01C51FE8.816068A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit I've been thinking about the fuel flow thing more and more lately. And since I love analogies so much, I'm going to make another... How many of you know what the gas mileage of your car/SUV is? Not what the sticker said when you bought it, but the actual mileage every time you fill up? I'll venture that it is a relatively small percentage of you. In the airplane world we seem to care a LOT more about fuel burn than we do in cars. Why is that? Is it because our planes are weight and range limited whereas, for all practical matters, our cars aren't? I personally don't really care whether I burn 8 GPH or 9 GPH in cruise. I'm not going to fuel plan that precisely. I can't. I don't always know whether I will fly at 6,000' or 12,000' and that makes a WHOLE lot larger difference in fuel planning than leaning. And just as in the car, I'd land and fuel up if I got lower on fuel than expected on a trip. I'll make a second venture - that the folks with FADEC don't care nor know as much about fuel burn as others do. In fact, I'll bet they couldn't tell you with anywhere near the level of accuracy that Walter or others out there can. Why? Because we don't stare at the fuel burn gauge, just as you couldn't care less about MPG of your SUV. It just doesn't matter. We have a pretty good idea of burn rate, and that's good enough. Matt ------=_NextPart_000_0037_01C51FE8.816068A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I've been thinking about the fuel flow thing more and more = lately. =20 And since I love analogies so much, I'm going to make another... 
 
 How many=20 of you know what the gas mileage of your car/SUV is?  Not what the = sticker=20 said when you bought it, but the actual mileage every time you fill = up? =20 I'll venture that it is a relatively small percentage of you.  In = the=20 airplane world we seem to care a LOT more about fuel burn than we do in=20 cars.  Why is that?  Is it because our planes are weight and = range=20 limited whereas, for all practical matters, our cars aren't? 
 
I personally don't really care whether I burn 8 GPH or 9 GPH in = cruise.  I'm not going to fuel plan that precisely.  I = can't.  I=20 don't always know whether I will fly at 6,000' or 12,000' and that makes = a WHOLE=20 lot larger difference in fuel planning than leaning.  And just = as in=20 the car, I'd land and fuel up if I got lower on fuel than expected on a=20 trip. 
 
I'll=20 make a second venture - that the folks with FADEC don't care nor = know as=20 much about fuel burn as others do.  In fact, I'll bet they couldn't = tell=20 you with anywhere near the level of accuracy that Walter or others out = there=20 can.  Why?  Because we don't stare at the fuel burn gauge, = just as you=20 couldn't care less about MPG of your SUV.  It just doesn't = matter.  We=20 have a pretty good idea of burn rate, and that's good=20 enough.
Matt
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