X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTP id 5730357 for flyrotary@lancaironline.net; Mon, 27 Aug 2012 09:16:52 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=2.0 cv=OtDNOlDt c=1 sm=0 a=g3L/TDsr+eNLfIieSKfGkw==:17 a=AHkS0RJitIMA:10 a=5uEnIVAMCIQA:10 a=05ChyHeVI94A:10 a=IkcTkHD0fZMA:10 a=h5CMovOnEx8A:10 a=ayC55rCoAAAA:8 a=HZJGGiqLAAAA:8 a=Ia-xEzejAAAA:8 a=7g1VtSJxAAAA:8 a=oCcaPWc0AAAA:8 a=j4XlMuUWAAAA:8 a=ecuFPh4kd-Ol_ApBUHMA:9 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=HeoGohOdMD0A:10 a=EzXvWhQp4_cA:10 a=g3L/TDsr+eNLfIieSKfGkw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 174.110.170.10 Received: from [174.110.170.10] ([174.110.170.10:61747] helo=EdPC) by cdptpa-oedge01.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id E9/2C-29356-0237B305; Mon, 27 Aug 2012 13:16:16 +0000 Message-ID: From: "Ed Anderson" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: [flyRotary] Spreadsheet Fuel Section Date: Mon, 27 Aug 2012 09:16:18 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="UTF-8"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 Thanks for the feed back and real-world comparison, Ernest. I use a 0.55 BSFC figure which may be a bit conservative (gives a higher fuel burn than actual), but I intentionally went conservative in many of those types of choices for the spreadsheet - I figured the builder had excessive optimism that needed to be compensated for {:>) So the difference may not be in noise of your data but the conservative lean of the spreadsheet. Ed -------------------------------------------------- From: "Ernest Christley" Sent: Sunday, August 26, 2012 11:12 PM To: "Rotary motors in aircraft" Subject: [FlyRotary] Re: [flyRotary] Spreadsheet Fuel Section > Ed, I've been trying to calculate my fuel flow and compare that to what > the spreadsheet gives. > > I'm running four 460cc/min injectors in two banks. For this paricular log > sample, bank1 has pulsewidth of 5.251ms and the second bank is firing for > 4.001ms. With a MAP at 28.5" (96.4kPa) and an intake temp of 91, the > engine is spinning 5550RPM with an AFR of 13.1. > > Using the fuel flow numbers I have, I should be burning 12.48gph. The > spreadsheet says the number would be 12.8gph. Given that these data logs > have a bit of noise, I call that good nuff' for gubment work. > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2197 / Virus Database: 2437/5226 - Release Date: 08/26/12 >