Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 768581 for flyrotary@lancaironline.net; Thu, 03 Mar 2005 12:59:25 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.66; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050303175840.PLRE2073.imf18aec.mail.bellsouth.net@rd> for ; Thu, 3 Mar 2005 12:58:40 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EWP Test Resulsts Date: Thu, 3 Mar 2005 11:59:33 -0600 Message-ID: <008a01c5201a$c18981a0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_008B_01C51FE8.76EF11A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_008B_01C51FE8.76EF11A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I agree, but OTOH less flow makes everything else more critical and a = higher temp drop across the radiator is needed.=20 It's true that changing the flow rate will change the equilibrium temp = of the coolant. That's the reason the Davies Craig controller works. The = only real question is how much flow is enough. There are so many variables, = that I defy anyone to calculate this for anyone's aircraft with any real accuracy. =20 Todd is probably doing a little better than 9 GPM as that was measured = at 12 V. He also got 7.7 GPM with a couple of GM evap cores which is still = better than I'm doing with one pump. I'm hoping that his instruments were more accurate than yours. IIRC, = your gauge started at 5 psi, so I would not expect it to be at it's best = accuracy at that level. At least I'm hoping it's not reading too high :-) =20 I ended up ordering a paddlewheel flowmeter that has a 3-30 gpm range. = ( http://www.mcmaster.com search for item number 3562K13) As far as I can tell, it does not have a remote readout option, but that's fine. It's = about $120 cheaper than the last one, and should be much better as well. I = still haven't decided if I'll mess with it this weekend. I'd like to, but I = have so much other stuff that's more important to do. I might just play with both pumps in the garage next week sometime. =20 I might also conclude that the pump is over designed for 100 HP per = rotor. :) =20 Agreed. The larger Meziere pump you're looking at is billed as being suitable for high HP applications. Let's face it, 200 ain't "high HP". = I don't think there's any doubt that the stock pump is overkill. =20 I think the only way the EWP will ever be truly accepted by this group = (the other group is hopeless) is when there are numerous flying examples. = Right now, Todd is the only one who gets full credit, but that's not good = enough because he lives in the "great white north". I have no real motivation = to change my system, other than wanting to prove that this works. Not sure = if that will be enough motivation though.=20 Cheers, Rusty (I believe) ------=_NextPart_000_008B_01C51FE8.76EF11A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I agree, but OTOH less flow makes everything else more = critical=20 and a higher temp drop across the radiator is needed. 

It's true that changing the = flow rate=20 will change the equilibrium temp of the coolant.  That's = the=20 reason the Davies Craig controller works.  The only real = question is=20 how much flow is enough.  There are so many variables, that I = defy=20 anyone to calculate this for anyone's aircraft with any real = accuracy. =20  

Todd is probably doing a little better than 9 GPM as = that was=20 measured at 12 V.  He also got 7.7 GPM with a couple of GM evap = cores which=20 is still better than I'm doing with one pump.

I'm hoping that his instruments = were more=20 accurate than yours.  IIRC, your gauge started at 5 psi, so I = would=20 not expect it to be at it's best accuracy at that level.  At = least I'm=20 hoping it's not reading too high :-)  

I ended up ordering a = paddlewheel=20 flowmeter that has a 3-30 gpm range.  ( http://www.mcmaster.com search = for item=20 number 3562K13) As far as I can tell, it does not have a remote readout = option,=20 but that's fine.  It's about $120 cheaper than the last one, and = should be=20 much better as well.  I still haven't decided if I'll mess with it = this=20 weekend. I'd like to, but I have so much other stuff that's more = important=20 to do.  I might just play with both pumps in the garage next week=20 sometime.   

I might also conclude that the pump is over designed = for 100=20 HP per rotor.  :)
 
Agreed.  The larger=20 Meziere pump you're looking at is billed as being suitable for high = HP=20 applications.  Let's face it, 200 ain't "high HP".  I don't = think=20 there's any doubt that the stock pump is overkill. =20  

I think the only way the = EWP will ever=20 be truly accepted by this group (the other group is hopeless) is when = there are=20 numerous flying examples.   Right now, Todd is the only one = who gets=20 full credit, but that's not good enough because he lives in the "great = white=20 north".  I have no real motivation to change my system, other than = wanting=20 to prove that this works.  Not sure if that will be enough=20 motivation though.

Cheers,
Rusty =  (I believe)
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