X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3319172 for flyrotary@lancaironline.net; Wed, 26 Nov 2008 19:35:33 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao104.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20081127003446.JLTI632.fed1rmmtao104.cox.net@fed1rmimpo01.cox.net> for ; Wed, 26 Nov 2008 19:34:46 -0500 Received: from BigAl ([72.192.137.74]) by fed1rmimpo01.cox.net with bizsmtp id k0am1a00D1cVYgg030amxc; Wed, 26 Nov 2008 19:34:46 -0500 X-Authority-Analysis: v=1.0 c=1 a=pMhYMaNkIDmyKPBj3QoA:9 a=EBrf3CSVSci4sSdEE6kA:7 a=ByF8vyQlRG5uqK_eYljjGRs9IaUA:4 a=EzXvWhQp4_cA:10 a=JqzK7hVu6n4A:10 a=VdCqVfIdz6xngloPMv0A:7 a=zEERDZPiTXTa1cHPOKz6ZXNhcMMA:4 a=37WNUvjkh6kA:10 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Fuel Burn Spreadsheet Date: Wed, 26 Nov 2008 16:34:42 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C94FE4.E22800A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 In-reply-to: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C94FE4.E22800A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable It's easy enough to adapt it to your airframe by going up and measuring = the fuel burn (read off the EM2) for a few different airspeeds to plug into column B. I did a similar thing by expanding on the simple spreadsheet Ernest posted some time back. It is interesting to take the data down = to a low enough speed where you see a minimum cost/mile - the speed below = which the cost increases. For my Velocity 20B the minimum cost/mile (no wind) = is at about 130 KTS - a fairly broad minimum so not much higher at 140-145, = but becomes more significant going up from there. =20 =20 But what does it really mean? You have to figure out the cost/min = saved, and decide what value you put on your time. If I cruise 160 KTAS vs 170 = I find (gas at $3.00/Ga) that saves about 40 cents for each minute of additional flying time. On a 4 hour x-country it takes 15 minutes = longer and costs about $6.00 less - out of about $125 fuel bill. When I'm up = there just for the joy of flying, or on a short trip; yeah, go slow - but on a long trip - eh, I think I'll go 170 - especially if I can get mogas for $2.00. =20 It's all fun. =20 Al G =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle Sent: Wednesday, November 26, 2008 1:42 PM To: Rotary motors in aircraft Subject: [FlyRotary] Fuel Burn Spreadsheet =20 The list has been too quiet lately, so I thought I would post this for = the group, but especially for Ed and Tracy. The spreadsheet was created by = Gary Casey, a Lancair driver, to calculate the fuel/cost penalty related to = going fast vs. a little slower, and allows you to see the difference in fuel = burn with specific headwinds and tailwinds. Gary has graciously permitted me post it on the Fly Rotary list. Since Tracy has stated on a number of occasions that he is a "thrifty" pilot, I thought he might enjoy = plugging some numbers into the spreadsheet and seeing how much he is saving. The formulas are based on a Mooney airframe, so keep that in mind. =20 =20 Mark S. Lancair ES-20B Austin, TX ------=_NextPart_000_0005_01C94FE4.E22800A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

It’s easy enough to adapt = it to your airframe by going up and measuring the fuel burn (read off the EM2) = for a few different airspeeds to plug into column B. I did a similar = thing by expanding on the simple spreadsheet Ernest posted some time back. = It is interesting to take the data down to a low enough speed where you see a = minimum cost/mile – the speed below which the cost increases. For my = Velocity 20B the = minimum cost/mile (no wind) is at about 130 KTS – a fairly broad minimum so not much = higher at 140-145, but becomes more significant going up from there. =

But what does it really = mean? You have to figure out the cost/min saved, and decide what value you put on = your time. If I cruise 160 KTAS vs 170 I find (gas at $3.00/Ga) that = saves about 40 cents for each minute of additional flying time. On a 4 = hour x-country it takes 15 minutes longer and costs about $6.00 less – = out of about $125 fuel bill. When I’m up there just for the joy of = flying, or on a short trip; yeah, go slow – but on a long trip – eh, = I think I’ll go 170 – especially if I can get mogas for = $2.00.

It’s all = fun.

Al G

-----Original = Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Wednesday, November = 26, 2008 1:42 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Fuel = Burn Spreadsheet

The list has been too quiet lately, so I = thought I would post this for the group, but especially for Ed and Tracy. = The spreadsheet was created by Gary Casey, a Lancair driver, to calculate = the fuel/cost penalty related to going fast vs. a little slower, and allows = you to see the difference in fuel burn = with specific headwinds and tailwinds. Gary has graciously permitted me post it on = the Fly Rotary list. Since Tracy has stated on a number of occasions that = he is a "thrifty" pilot, I thought he might enjoy plugging some = numbers into the spreadsheet and seeing how much he is saving. The formulas are = based on a Mooney airframe, so keep that in mind.

Mark S.

Lancair ES-20B

Austin, TX

------=_NextPart_000_0005_01C94FE4.E22800A0--