Return-Path: Received: from [216.52.245.18] (HELO ispwestemail2.mdeinc.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 521637 for flyrotary@lancaironline.net; Sun, 07 Nov 2004 13:49:14 -0500 Received-SPF: none receiver=logan.com; client-ip=216.52.245.18; envelope-from=wschertz@ispwest.com Received: from 7n7z201 (unverified [67.136.146.19]) by ispwestemail2.mdeinc.com (Vircom SMTPRS 4.0.330.8) with SMTP id for ; Sun, 7 Nov 2004 10:48:42 -0800 Message-ID: <003e01c4c4fa$6971cbb0$13928843@7n7z201> From: "William" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EWP Info Date: Sun, 7 Nov 2004 12:48:44 -0600 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 No thermostat. and yes you are interpreting the curve correctly. Bill Schertz KIS Cruiser # 4045 ----- Original Message ----- From: "Bob White" To: "Rotary motors in aircraft" Sent: Sunday, November 07, 2004 10:37 AM Subject: [FlyRotary] Re: EWP Info > Thanks Bill, > > One question. Did you have a thermostat in the engine when you did > these measurements? That would effect the pressure and flow rates. > > Of course what I need to know is how much flow is sufficient for full > power cooling. If I take the crossing point of the 'two core' data and > the 5594 RPM data as an indication, it looks like around 9 psi and 33 > GPM is what the factory pump is providing. This should be similar to > Tracy Crook's situation. Am I looking at that correctly? > > Bob White > > On Sun, 7 Nov 2004 09:09:56 -0600 > "William" wrote: > >> Bob, >> Attached is a graph of the performance of a Mazda mechanical pump at >> different rpm. Several things about the performance can be deduced. >> The measurements were taken by pumping water from a barrel through the >> engine and back to the barrel. Flow was measured by the time required >> to fill a 5 gallon bucket, and pressure drop was measured into and out >> of the engine water pump. >> >> First, at zero flow, the pump is generating its maximum pressure. At >> zero pressure, the pump is generating its maximum flow. Since the >> measurements are made at the inlet and outlet of the pump, the >> pressure drop of the engine core is included. If you look at the three >> rpm curves, at 2448 rpm, the pump can generate just under 5psi head, >> and a no head flow of ~20gpm. this means that the pressure drop >> through the core is 5 psi at 20 gpm. >> >> At 3730 rpm you get 8.5 psi and 33 gpm, at 5594 you get 19psi and 44 >> gpm. >> >> I also measured the pressure drop across GM evap cores as a function >> of flow. Data is plotted on the curve. >> >> Bill Schertz >> KIS Cruiser # 4045 >> ----- Original Message ----- >> From: "Bob White" >> To: "Rotary motors in aircraft" >> Sent: Saturday, November 06, 2004 9:39 PM >> Subject: [FlyRotary] Re: EWP Info >> >> >> > On Sat, 6 Nov 2004 20:52:55 -0600 >> > "Russell Duffy" <13brv3@bellsouth.net> wrote: >> > >> > > Hi Bob, somehow these numbers do not pass the "smell test". There >> > > is no way you can pump 20 GPM with the back pressure in the system >> > > on 5 Amps alone. Larry's observations below make sense. A little >> > > air blower motor moving air uses 5 Amps. Bulent >> > > >> > > >> > > Hi Bulent, >> > > >> > > You're starting to sound like a disbeliever. We're not going to >> > > have to banish you to the other list are we :-) >> > > >> > > Rusty (I believe) >> > > >> > >> > Now now! Let's not have any banishing around here. :) >> > >> > I don't know what the numbers mean but I will let you know how it >> > works out. Todd reported his pump measured 4.3 amps at 9.3 gpm (if >> > I understood his last post). Mezarie may be reporting the "no load" >> > pumping capacity, or Summit may have the current wrong. I should >> > have the pumps sometime next week. >> > >> > Any idea what a ball park figure for the pressure drop across the >> > engine and an evap core would be? I could simulate it on the bench. >> > >> > Bob White >> > >> > >> > -- >> > http://www.bob-white.com >> > N93BD - Rotary Powered BD-4 (soon) >> > >> > >> Homepage: http://www.flyrotary.com/ >> > >> Archive: http://lancaironline.net/lists/flyrotary/List.html >> > > > -- > http://www.bob-white.com > N93BD - Rotary Powered BD-4 (soon) > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html