X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 718984 for flyrotary@lancaironline.net; Mon, 12 Sep 2005 06:51:28 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-065-188-083-049.carolina.res.rr.com [65.188.83.49]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j8CAoe1v012602 for ; Mon, 12 Sep 2005 06:50:42 -0400 (EDT) Message-ID: <001f01c5b787$d86c4790$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Optimal GPM water pump flow. Date: Mon, 12 Sep 2005 06:50:52 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001C_01C5B766.511CB430" 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 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_001C_01C5B766.511CB430 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable No question that two cores plumbed in parallel is more efficient in = transferring heat due to the greater delta T. Also, With less = restriction, your flow through the cores would likely be greater (than = two in series) again aiding in the heat transfer from engine to air. = The possible down side is more complex plumbing and some folks have = reported problems with balancing the flow through two parallel = radiators. Mine are plumbed in series (mainly to simplify plumbing) and = have worked fine. Ed A ----- Original Message -----=20 From: George Lendich=20 To: Rotary motors in aircraft=20 Sent: Monday, September 12, 2005 2:40 AM Subject: [FlyRotary] Re: Optimal GPM water pump flow. Dave, I don't know for sure myself but the so called experts on another site = recommend that 2 cooler should run in parallel - FWIW. George ( down under) Al. What I am after is trying to determine what the minimum required = flow is for the horsepower generated. More than anything else, I do not = want to be BELOW that amount, and consider it a minimum. Understandably, = trying to place twice or nearly 3 times the flow through the same = circuit will result in higher pressures and perhaps some pump = cavitation. I will deal with that as I have to.. more than anything else = I want to make sure I am not starting off with a DEFICIT of water flow = ability. =20 I am considering 2 smaller radiators, and originally I intended to = plumb them in series to get the best cumulative Delta-T across them, but = if I have "pressure" problems due to the pump's flow, I may go to a = parralel arrangement.=20 =20 Feel free to critique, Al.. My cooling system is a work in progress = that is evolving. I live in a place that has 100 degree temps with 90% = humidity at times, and given the other folks demonstrated problems with = inadequate cooling, I am very much in favor of designing in excess = cooling capacity, to the point I may even incur a slight weight or drag = penalty, such that I don't have to give constant attention to the risk = of overheating. =20 Dave Al Gietzen wrote: Subject: [FlyRotary] Re: Optimal GPM water pump flow. www.racemate.com They were unable to find the photo of the Mazda = install but they say the did a few. I am going to take the plunge and = get one..=20 Dave Just curious what you're after with the racemate. You were asking = about "optimal" flow - double the needed flow is not optimum; high = pressure gradients around the loop, unnecessary pumping power. Al-- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ =20 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_001C_01C5B766.511CB430 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
No question that two cores plumbed in = parallel is=20 more efficient in transferring heat due to the greater delta T.  = Also, With=20 less restriction, your flow through the cores would likely be greater = (than two=20 in series) again aiding in the heat transfer from engine to air.  = The=20 possible down side is more complex plumbing and some folks have reported = problems with balancing the flow through two parallel radiators.  = Mine are=20 plumbed in series (mainly to simplify plumbing) and have worked=20 fine.
 
Ed A
 
----- Original Message -----
From:=20 George=20 Lendich
Sent: Monday, September 12, = 2005 2:40=20 AM
Subject: [FlyRotary] Re: = Optimal GPM=20 water pump flow.

Dave,
I don't know for sure myself but the = so called=20 experts on another site recommend that 2 cooler should run in parallel = -=20 FWIW.
George ( down under)
Al.
  =20 What I am after is trying to determine what the minimum required = flow is for=20 the horsepower generated.  More than anything else, I do not = want to be=20 BELOW that amount, and consider it a minimum. Understandably, trying = to=20 place twice or nearly 3 times the flow through the same circuit will = result=20 in higher pressures and perhaps some pump cavitation. I will deal = with that=20 as I have to.. more than anything else I want to make sure I am not = starting=20 off with a DEFICIT of water flow ability.
 
I am = considering 2=20 smaller radiators, and originally I intended to plumb them in series = to get=20 the best cumulative Delta-T across them, but if I have "pressure" = problems=20 due to the pump's flow, I may go to a parralel arrangement.=20
 
Feel free to critique, Al.. My cooling system is a = work in=20 progress that is evolving. I live in a place that has 100 degree = temps with=20 90% humidity at times, and given the other folks demonstrated = problems with=20 inadequate cooling, I am very much in favor of designing in excess = cooling=20 capacity, to the point I may even incur a slight weight or drag = penalty,=20 such that I don't have to give constant attention to the risk of=20 overheating.
 
Dave

Al Gietzen wrote:

Subject: = [FlyRotary] Re: Optimal GPM water pump flow.

 

www.racemate.com   They =
were unable to find the photo of the Mazda install but they say the did =
a few. I am going to take the plunge and get one..=20



Dave
 
Just curious what you=92re after with the =
racemate.  You were asking about =93optimal=94 flow =96 double the =
needed flow is not optimum; high pressure gradients around the loop, =
unnecessary pumping power.
 
Al
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