Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Tue, 15 Oct 2002 23:59:32 -0400 Message-ID: X-Original-Return-Path: Received: from [148.78.247.23] (HELO apollo.email.starband.net) by logan.com (CommuniGate Pro SMTP 4.0b9) with ESMTP id 1806407 for flyrotary@lancaironline.net; Tue, 15 Oct 2002 23:32:44 -0400 Received: from starband.net (vsat-148-64-132-119.c005.g4.mrt.starband.net [148.64.132.119]) by apollo.email.starband.net (8.12.4/8.12.4) with ESMTP id g9G3XGDp009788 for ; Tue, 15 Oct 2002 23:33:20 -0400 X-Original-Message-ID: <3DACDF15.EB970359@starband.net> X-Original-Date: Tue, 15 Oct 2002 23:37:57 -0400 From: Jim Sower X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 X-Original-To: " (Rotary motors in aircraft)" Subject: Re: [FlyRotary] Re: EWP water pump References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit <... stock pump with the EWP in a given system ...> I'm not trying to compare a particular EWP with stock under any particular conditions. I'm interested in determining the *requirements* of the engine under as many conditions as possible. I figure that it will involve a thermostat and a coolant flow measuring device. Absent a thermostat, we don't know how much more coolant we're pumping than is necessary. With a thermostat maintaining temperature, we are much more assured that the flow observed is exactly what is needed for proper heat rejection under those circumstances. I don't believe that pressure drop helps much, if for no other reason than that a small (read difficult to measure accurately) error in pressure drop would mask a large flow difference. If we measure flow directly and accurately at the temperature we want to maintain on the engine, we can search for an EWP that meets those requirements and our questions are pretty much answered. I believe that a thermostat and a flow meter are pivotal and would personally be reluctant to proceed without them. Just a theory .... Jim S. Tracy Crook wrote: > > Posted for Jim Sower : > > I don't think we can estimate squat. If we could find a coolant > > flow transducer in a maybe 35-40 mm line, Tracy and Ed could > > patch it into their radiator hoses and measure what the > > by-gawd-for-really flow is under various conditions. That done, > > it would be simple enough to get some various EWPs patched into > > the system and find out just how much electrical power it takes > > to generate that flow. For the reference flow figures, the > > airplane would have to be flying under the conditions tested. > > For the EWP test, the engine wouldn't even have to be running. > > Simple as that (not to be confused with easy ... :o) > > Just a theory .... Jim S. > > > > > > To compare the stock pump with the EWP in a given system you really don't > need a fancy flow meter. Just measure the pressure drop through the system > with a pressure gauge between pump outlet and after the rad. The higher the > pressure, the higher the flow is. > > Tracy Crook > tcrook@rotaryaviation.com > www.rotaryaviation.com > > >> Homepage: http://www.flyrotary.com/