Return-Path: <13brv3@bellsouth.net> Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 767732 for flyrotary@lancaironline.net; Wed, 02 Mar 2005 22:14:15 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.68; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050303031327.OYUX1995.imf20aec.mail.bellsouth.net@rd> for ; Wed, 2 Mar 2005 22:13:27 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] EWP Test Resulsts Date: Wed, 2 Mar 2005 21:14:18 -0600 Message-ID: <006301c51f9f$169853f0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0064_01C51F6C.CBFDE3F0" 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_0064_01C51F6C.CBFDE3F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I will be very interested in your Craig-Davies experiment. It seems to = me that this flow rate is very marginal. I had considered using a single Mezirie WP336, but thought having two pumps for redundency would be preferable. Earlier I tested the unrestricted flow rate for one of = these pumps at 16 GPM using cold water. The only way it could meet = specifications would be to see an increase in flow at higher temperatures. Thanks for the good info Bob. Those flow rates do seem kinda low, but = not necessarily too low. IIRC, Todd was getting about 9 gpm with a single Davies Craig pump, and was doing just fine on temps. You would have considerably more than that with two pumps, and less with a single. If = you run the pumps in series, you can probably use the second one only for = climb and maybe really hot days in cruise. =20 Keep in mind that no one has proven any flow rate that's required for = our engines. There are lots of charts, and numbers floating around, but = none of it really means much to me, because there are too many variables. = Ernest said that I hadn't proven mine in flight, and he's right. That's what counts, and we would all do well to remember that. Nevertheless, I = can't help but want to test the flow rates of the two pumps, though any flow = rates that I get will not prove that either will work, but it will show which = pump flows the most water in a similar test. =20 Cheers, Rusty (new flowmeter ordered) ------=_NextPart_000_0064_01C51F6C.CBFDE3F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I will be very interested in your Craig-Davies = experiment. =20 It seems to me that this flow rate is very marginal.  I had = considered=20 using a single Mezirie WP336, but thought having two pumps for = redundency would=20 be preferable.  Earlier I tested the unrestricted flow rate for one = of=20 these pumps at 16 GPM using cold water.  The only way it could meet = specifications would be to see an increase in flow at higher=20 temperatures.

Thanks for the good info Bob.  Those flow rates do seem = kinda low,=20 but not necessarily too low.  IIRC, Todd was getting about 9 gpm = with a=20 single Davies Craig pump, and was doing just fine on temps.  You = would have=20 considerably more than that with two pumps, and less with a = single.  =20 If you run the pumps in series, you can probably use the second one only = for=20 climb and maybe really hot days in cruise.  

Keep in = mind that no one=20 has proven any flow rate that's required for our engines.  There = are lots=20 of charts, and numbers floating around, but none of it really means much = to me,=20 because there are too many variables.  Ernest said that I hadn't = proven=20 mine in flight, and he's right.  That's what counts, and we would = all do=20 well to remember that.   Nevertheless, I can't help but want = to test=20 the flow rates of the two pumps, though any flow rates that I get = will not=20 prove that either will work, but it will show which pump flows the most = water in=20 a similar test. 

Cheers,

Rusty (new = flowmeter=20 ordered)

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