Return-Path: Received: from razorbill.mail.pas.earthlink.net ([207.217.121.248] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2635837 for flyrotary@lancaironline.net; Mon, 13 Oct 2003 21:22:29 -0400 Received: from h-69-3-221-125.chcgilgm.dynamic.covad.net ([69.3.221.125] helo=barrygardner) by razorbill.mail.pas.earthlink.net with asmtp (Exim 3.33 #1) id 1A9DtM-0003dR-00 for flyrotary@lancaironline.net; Mon, 13 Oct 2003 18:22:28 -0700 Message-ID: <002e01c391f1$9fe49750$6401a8c0@barrygardner> Reply-To: "Barry Gardner" From: "Barry Gardner" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EWP - series pumps and wacky ideas Date: Mon, 13 Oct 2003 20:22:24 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-ELNK-Trace: 35113b5cbbf614506e07e7704c03dc60f402879cecb40bd5f3de3b92799677ff15fc4b91dad68438c26d7f41d6bd0dd4350badd9bab72f9c350badd9bab72f9c Rino wrote: > My installation has the two pumps in parallel. Either pump gives me a > pressure of 40 psi. When I switch both pumps I get a pressure of 55 > psi. That pressure difference would affect fuel flow at the injectors. > I do not know if it is a good thing of not. because of the pressure > difference I plan on using one pump only at a time. Corky Bell wrote in "Maximum Boost" that "Fuel flow changes through a nozzle are proportional to the square root of the pressure change across the nozzle." p 92 Barry Gardner Wheaton, IL