Return-Path: Received: from fed1rmmtao10.cox.net ([68.230.241.29] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 520911 for flyrotary@lancaironline.net; Sat, 06 Nov 2004 18:54:39 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.29; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao10.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20041106235410.BFLC18545.fed1rmmtao10.cox.net@BigAl> for ; Sat, 6 Nov 2004 18:54:10 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EWP Date: Sat, 6 Nov 2004 15:54:19 -0800 Message-ID: <000001c4c45b$ee902a70$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4C418.E071CC70" 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 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4C418.E071CC70 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Based on Todd's correction of the earlier unbelievable numbers on = current drawer, you can expect somewhere in the neighborhood of 35-40 amps continuous for 25 gpm of flow (which is believable) - if the pump will produce that much flow in a real cooling system. That's based on the = pump power going roughly as the square of the flow rate.=20 =20 Al =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Todd Bartrim Sent: Saturday, November 06, 2004 1:28 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: EWP =20 Whoaa, before anybody gets worked up over my current draw figures, I'd = made a mistake in my report and had sent another post correcting it the next = day. Below is the corrected post.... hmmnn, is there a way of going back into = the archives to correct erroneous data, as this same issue came up once = before based on my incorrect data post. =20 Hi Guy's I had a hard time believing the current draw for the pump so I brought home my good "Fluke" multimeter from work. The one I used last = night was a cheap Digital meter from "Canadian Tire". I seldom use this one, = so I'm not familiar with it but since it is very similar in outward = appearance to my "Fluke 87" I assumed the same functions would apply. They don't. OK,OK, enough excuses, now for the real current draw. * continuous current draw - 4.3 amps=20 * max inrush current draw at 100mS - 6.8 amps=20 * max inrush current draw at 250uS - 13 amps=20 * continuous current draw at minimum controlled flow - .2 amps The max inrush current is not really relevant to our concerns, but there = it is for those that care. This higher current flow is still well within acceptable limits for my needs, and I expect that while in cruise flight, the controller will be reducing pump speed and current draw. I've reposted the flow measurements along with this post with the = incorrect current draw deleted. I hope this clears up any confusion about EWP = current requirements. I=20 I ran the first test with the Ford evap cores in the system, = plumbed in parallel. * Max flow 9.3 usg/m 35 l/m=20 * 12.07 volt battery supply voltage=20 * =20 Second test had no evap cores in the system. Simply recirced water through pump - engine - header tank - pump. * max flow 13.0 usg/m 49 l/m=20 * 12.06 volt battery supply voltage=20 * =20 Third test, I plumbed in a set of GM (Harrison) evap cores in = parallel, into the system. I hung them just below my mounted Ford cores, using = they same pipe sizes in an effort to have comparable test conditions. * max flow 7.7 usg/m 29 l/m=20 * 12.4 volts supply voltage (I hooked a trickle charger to the battery)=20 * =20 In each test configuration test results are with heater valve = closed. Heater core added .5 usg/m in each case. =20 In all of the above tests the electronic pump controller was = bypassed to give full battery voltage to the pump. With the pump controller in use, = as the water was cold well water, controller had pump at minimum flow which = was measured at .6 usg/m - 2.2 l/m.=20 =20 I've just been lurking since returning from school as I've got allot to catch up on around here, so am trying not to get distracted with the = list, however I needed to jump in on this one. I need to head out to the = airport today to install my new radio and hopefully get out for a flight, as = they are calling for 5" of snow tonight. =20 Todd Bartrim =20 RV9Endurance 13B Turbo Rotary C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm =20 "The world will always have a place for those that bring = hard work and determination to the things they do." =20 ------=_NextPart_000_0001_01C4C418.E071CC70 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Based on Todd’s correction = of the earlier unbelievable numbers on current drawer, you can expect somewhere = in the neighborhood of 35-40 amps continuous for 25 gpm of flow (which is = believable) – if the pump will produce = that much flow in a real cooling system.  That’s based on the pump = power going roughly as the square of the flow rate.

 

Al

 

-----Original = Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Todd Bartrim
Sent: Saturday, November = 06, 2004 1:28 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = EWP

 

Whoaa, before = anybody gets worked up over my current draw figures, I'd made a mistake in my = report and had sent another post correcting it the next day. Below is the = corrected post.... hmmnn, is there a way of going back into the archives to = correct erroneous data, as this same issue came up once before based on my incorrect data = post.

 

Hi Guy's
        I had a hard time believing = the current draw for the pump so I brought home my good "Fluke" multimeter from work. The one I used last night was a cheap Digital = meter from "Canadian Tire". I seldom use this one, so I'm not familiar = with it but since it is very similar in outward appearance to my "Fluke = 87" I assumed the same functions would apply. They don't.

 OK,OK, enough excuses, now for the real = current draw.

·        continuous current draw - 4.3 = amps

·        max inrush current draw at = 100mS - 6.8 amps

·        max inrush current draw at 250uS - 13 = amps

·        continuous current draw at minimum controlled = flow - .2 amps

The max inrush current is = not really relevant to our concerns, but there it is for those that = care.

This higher current flow is = still well within acceptable limits for my needs, and I expect that while in = cruise flight, the controller will be reducing pump speed and current = draw.

I've reposted the flow measurements along with this = post with the incorrect current draw deleted. I hope this clears up any confusion = about EWP current requirements. I 


        I ran the first test with the = Ford evap cores in the system, plumbed in parallel.

·        Max flow 9.3 usg/m  35 l/m =

·        12.07 volt battery supply = voltage

·         

    Second = test had no evap cores in the system. Simply recirced water through pump - engine - = header tank - pump.

·        max flow 13.0 usg/m   49 = l/m

·        12.06 volt battery supply = voltage

·         

    Third = test, I plumbed in a set of GM (Harrison) evap cores in parallel, into the = system. I hung them just below my mounted Ford cores, using they same pipe sizes = in an effort to have comparable test conditions.

·        max flow 7.7 usg/m   29 = l/m

·        12.4 volts supply voltage (I hooked a trickle = charger to the battery)

·         

    In each = test configuration test results are with heater valve closed. Heater core = added .5 usg/m in each case.

 

    In all = of the above tests the electronic pump controller was bypassed to give full battery = voltage to the pump. With the pump controller in use, as the water was = cold well water, controller had pump at minimum flow which was measured at .6 usg/m - 2.2 l/m.

 

I've just been = lurking since returning from school as I've got allot to catch up on around = here, so am trying not to get distracted with the list, however I needed to jump in = on this one. I need to head out to the airport today to install my new radio and hopefully get out for a flight, as they are calling for 5" of snow tonight.

 

Todd = Bartrim

 

RV9Endurance

13B Turbo = Rotary

C-FSTB

 

    &nbs= p;        "The world will always have a place for those that bring hard work = and determination to the things they do."

 

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