Return-Path: Received: from fed1rmmtao12.cox.net ([68.230.241.27] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 766002 for flyrotary@lancaironline.net; Wed, 02 Mar 2005 00:48:00 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.27; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao12.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050302054712.DFNA13819.fed1rmmtao12.cox.net@BigAl> for ; Wed, 2 Mar 2005 00:47:12 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] EWP, head or not to head Date: Tue, 1 Mar 2005 21:47:27 -0800 Message-ID: <000001c51eeb$5144ac10$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Our closed loop coolant systems will have friction equavalant to some head pressure, but if it is over 2 inches I'll eat my hat. Eric; Do you have a hat with a good flavor? The pressure head equivalent of the pressure drop around a cooling loop is much greater than 2", at cruise conditions; well over 2 feet. But d__n, right now I can't find the charts. Bill; do you have data for your loop, or at least through the engine; that you could re-post?? My Ron Davis Radiator (one of two in parallel in my system) has a pressure drop of 2.25 psi at 20 gpm (roughly cruise condition); that's an equivalent head of 4.9 feet. Al