Return-Path: Received: from [65.54.169.130] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2625127 for flyrotary@lancaironline.net; Sun, 05 Oct 2003 16:11:17 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sun, 5 Oct 2003 13:11:13 -0700 Received: from 65.137.50.189 by bay3-dav100.bay3.hotmail.com with DAV; Sun, 05 Oct 2003 20:11:12 +0000 X-Originating-IP: [65.137.50.189] X-Originating-Email: [lors01@msn.com] Reply-To: "Tracy Crook" From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Electric Water Pumps and Heat Rejection Date: Sun, 5 Oct 2003 16:13:40 -0400 Organization: Real World Solutions Inc. MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" 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 Message-ID: X-OriginalArrivalTime: 05 Oct 2003 20:11:13.0147 (UTC) FILETIME=[D32A34B0:01C38B7C] Subject: [FlyRotary] Re: Electric Water Pumps and Heat Rejection > Ed, et.al. > Last year I made measurements on the Mazda Water pump installed on the > block, pumping the water through the block. I have a 225K PDF file > describing the tests. if someone wants a personal copy, email me and I will > send it out. > > Key points: I drove the pump at 2500 to 5500 rpm, by varying pulley size. I > drove the pump with a 1.5 horsepower saw motor, and had no difficulty using > only one belt. However, when I tried an 8 inch drive pulley supplied by Paul > Lamar to go higher in pump rpm, the motor would blow my circuit-breaker. So > the power goes up dramatically as the rpm goes up, but at reasonable rpm, > the power is within the capability of the 1.5horse motor. > Bill Schertz Just one additional comment on this subject. The power required (for a centrifugal pump) varies with rpm and head pressure (which determines volume). But here is the point - Volume is the key parameter. If you restrict volume with higher head pressure, power required goes DOWN, not up. Most everyone here has heard the effect when you restrict the flow through a vacuum cleaner (a centrifugal pump). This has several implications in an aircraft application. Tracy Crook