Return-Path: Received: from [65.54.169.158] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2981035 for flyrotary@lancaironline.net; Sat, 07 Feb 2004 15:00:49 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 7 Feb 2004 12:00:47 -0800 Received: from 67.25.179.68 by bay3-dav128.bay3.hotmail.com with DAV; Sat, 07 Feb 2004 20:00:47 +0000 X-Originating-IP: [67.25.179.68] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: water pump with 2 outlets Date: Sat, 7 Feb 2004 15:00:45 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0074_01C3ED8B.29A71A40" 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: 07 Feb 2004 20:00:47.0976 (UTC) FILETIME=[142B6E80:01C3EDB5] This is a multi-part message in MIME format. ------=_NextPart_000_0074_01C3ED8B.29A71A40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Good question and I agree with your reasoning on flow *IF* the reason = for uneven split is not due to the dynamics of hydraulic flow at = intersections. I'm not an expert on the subject but I did see a clear = case of unequal flow through perfectly matched flow paths when the paths = were connected with a T intersection of equal cross section. A T is = clearly the wrong choice but other shapes are not any guarantee that = "hydraulic lockout" will not occure. The best advice I can give on this point is to use very different cross = section areas between the single feed and the two outputs. Same = principle applies when bringing two paths back together. This lessens = the likelyhood of problems. That is all I was able to acertain from the = graphs I saw on the subject. Tracy Why would we expect that the two outlets from this pump would provide = any more equal flow split than dividing the outlet from one pump outlet = into two circuits? Either way the flow is going to split in proportion = to the pressure drop in each of the two loops. Al Ken, let us know if you figure out which Toyota models use this pump. Barry Gardner Wheaton, IL ----- Original Message -----=20 From: To: "Rotary motors in aircraft" Sent: Thursday, February 05, 2004 8:06 PM Subject: [FlyRotary] water pump with 2 outlets > I keep looking at all the successful, flying rotary engine airplanes = that are using evaporator cores and can't help but wonder if this is the = hot setup. Just for everyones consideration, some Toyota's use a = standalone water pump that has 2 outlet ports. These look to be about .7" in = diameter but I have not measured the size. I can't help but consider using = this pump mounted 'low' and using an adapter like the guys using EWP's are = using. These 2 outlets from the water pump can be used to run 2 evaporators = cores in parallel without fighting with the uneven flow that most other = setups deal with. Advantages are: > 1. LOW mounted water pump (what is the flow rating of this pump?) > 2. parrallel flow to 2 evaporator cores > 3. more even coolant distribution to the cores > > Thanks, > Ken Powell > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0074_01C3ED8B.29A71A40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Good question and I agree with your = reasoning on=20 flow *IF* the reason for uneven split is not due to the dynamics = of=20 hydraulic flow at intersections. I'm not an expert on the subject = but I=20 did see a clear case of unequal flow through perfectly matched flow = paths when=20 the paths were connected with a T intersection of equal cross = section. A T=20 is clearly the wrong choice but other shapes are not any guarantee that=20 "hydraulic lockout" will not occure.

The best advice I can give on this = point is to use=20 very different cross section areas between the single feed and the = two=20 outputs. Same principle applies when bringing two paths back = together. This lessens the likelyhood of problems. That is = all I was=20 able to acertain from the graphs I saw on the subject.

Tracy

Why would we expect = that the two=20 outlets from this pump would provide any more equal flow split than = dividing=20 the outlet from one pump outlet into two circuits? Either way = the flow=20 is going to split in proportion to the pressure drop in each of the = two=20 loops.

Al

Ken, let us know if you figure out which=20 Toyota models use this pump.

Barry Gardner

Wheaton, IL

----- Original Message ----- =

From: = <kenpowell@comcast.net>

To: "Rotary motors in aircraft"=20 <flyrotary@lancaironline.net>

Sent: Thursday, February 05, = 2004 8:06=20 PM

Subject: [FlyRotary] water pump with 2=20 outlets

> I keep looking at all the successful, = flying=20 rotary engine airplanes that

are using evaporator cores and can't help = but wonder=20 if this is the hot

setup. Just for everyones = consideration, some=20 Toyota's use a standalone

water pump that has 2 outlet ports. = These look=20 to be about .7" in diameter

but I have not measured the size. I = can't help=20 but consider using this pump

mounted 'low' and using an adapter like the = guys using=20 EWP's are using.

These 2 outlets from the water pump can be = used to run=20 2 evaporators cores

in parallel without fighting with the uneven = flow that=20 most other setups

deal with. Advantages = are:

> 1. LOW mounted water pump (what = is the flow=20 rating of this pump?)

> 2. parrallel flow to 2 evaporator = cores

> 3. more even coolant distribution = to the=20 cores

>

> Thanks,

> Ken Powell

>

>

> >> Homepage: =20 http://www.flyrotary.com/

> >> Archive: =20 http://lancaironline.net/lists/flyrotary/List.html

>> Homepage: =20 http://www.flyrotary.com/

>> Archive: =20 = http://lancaironline.net/lists/flyrotary/List.html

------=_NextPart_000_0074_01C3ED8B.29A71A40--