Return-Path: Received: from fed1rmmtao04.cox.net ([68.230.241.35] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 764500 for flyrotary@lancaironline.net; Tue, 01 Mar 2005 10:24:31 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.35; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao04.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050301152343.MAMO15592.fed1rmmtao04.cox.net@BigAl> for ; Tue, 1 Mar 2005 10:23:43 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: [FlyRotary]actual water flow was Belt rumnations; soliciting Opinions of racers please.... Date: Tue, 1 Mar 2005 07:23:58 -0800 Message-ID: <000001c51e72$b06d8640$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 Theoretically (sorry, Leon), you need 20GPM to cool the engine if you have a 30degree drop across the radiators. Is that right, Al? ------------------- Like everything else, it depends on conditions. Here's a data point - producing 75 hp per rotor (call it high cruise), using 50-50 EG/water, it takes 12.7 gpm per rotor to reject the heat with a 30 F delta T. I think that is a pretty good design point. For optimum rad design, cooling drag, blah, blah. . . you'd like a bit lower delta T, and more flow; but hey, that's about all the stock pump is going to give. Al