Return-Path: <13brv3@bellsouth.net> Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 796913 for flyrotary@lancaironline.net; Wed, 16 Mar 2005 21:38:02 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf17aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050317023717.IQTK14338.imf17aec.mail.bellsouth.net@rd> for ; Wed, 16 Mar 2005 21:37:17 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Electric water pump Date: Wed, 16 Mar 2005 20:35:28 -0600 Message-ID: <00d701c52a99$fbaba460$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D8_01C52A67.B1113460" 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_00D8_01C52A67.B1113460 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Another point that I'd like to bring up right now is hose sizes. I = often hear the statement that a car is only run on 30% power on average and = yet the auto manufactures use a minimum of 1 1/4" hoses for coolant. But in = our airplanes builders commonly use much smaller hoses & fittings usually in order to use AN fittings of which I believe AN16 is the largest (correct = me if I'm wrong) and is only 3/4". I don't understand this reasoning. I = used 1 1/4" hoses up to the "T" where the rads are plumbed in parallel, where I step it down to 2 -1"hoses. Even the "T's" were made with minimum restriction in mind. If we have a higher power demand from the engine = (which is always used as a reason not to use EWP's), then why restrict it's = coolant flow? =20 Hi Todd, =20 If I'm not mistaken, Tracy is using 3/4" hoses??? I've been using AN12 hoses, with two evap cores in series, and there has never been a = question of cooling the water on the RV-3, even in severe climb tests. The antique mechanical pump does have a lot of muscle, and might be making up for it though, and I still haven't found a way to test the EWP by itself in = flight. =20 Cheers, Rusty (wondering where my font appeared)=20 =20 =20 ------=_NextPart_000_00D8_01C52A67.B1113460 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
    Another point that I'd like to = bring up right=20 now is hose sizes. I often hear the statement that a car is only run on = 30%=20 power on average and yet the auto manufactures use a minimum of 1 1/4" = hoses for=20 coolant. But in our airplanes builders commonly use much smaller hoses = &=20 fittings usually in order to use AN fittings of which I believe AN16 is = the=20 largest (correct me if I'm wrong) and is only 3/4". I don't understand = this=20 reasoning. I used 1 1/4" hoses up to the "T" where the rads are plumbed = in=20 parallel, where I step it down to 2 -1"hoses. Even the "T's" were made = with=20 minimum restriction in mind. If we have a higher power demand from the = engine=20 (which is always used as a reason not to use EWP's), then why restrict = it's=20 coolant flow?
 
 Hi=20 Todd,
 
If I'm not mistaken, = Tracy is using=20 3/4" hoses???  I've been using AN12 hoses, with two evap cores = in=20 series, and there has never been a question of cooling the water on = the=20 RV-3, even in severe climb tests.  The antique=20 mechanical pump does have a lot of muscle, and might be making up=20 for it though, and I still haven't found a way to test the EWP by = itself in=20 flight.
 
Cheers,
Rusty (wondering where = my font=20 appeared) 
 
  
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