Return-Path: <13brv3@bellsouth.net> Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 769337 for flyrotary@lancaironline.net; Thu, 03 Mar 2005 20:10:04 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf22aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050304010919.WIKZ2068.imf22aec.mail.bellsouth.net@rd> for ; Thu, 3 Mar 2005 20:09:19 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EWP flowrate and underdrive pulleys Date: Thu, 3 Mar 2005 19:10:14 -0600 Message-ID: <00c801c52056$ec10fde0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C9_01C52024.A1768DE0" 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_00C9_01C52024.A1768DE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Ok Rusty, Lets be clear here, the reason to run an underdrive pulley = isn't to reduce FLOW. The reason is to prevent CAVITATION. This is = dramatically different than trying to reduce flow.=20 The ads for the pulley's say they reduce wasted power, and reduce the = chance of cavitation. Perhaps the only significant advantage is the reduced = chance of cavitation, but that's not how they're advertised. =20 Since you are using the EWP as a backup (which seems a sound idea) you aren't sure it will do the whole job.=20 The best way to make me prove that it will work, is to keep telling me = it won't :-) =20 Seriously, I'm quite happy with my current system. It's really the best = of both worlds, but it would still be valuable to prove (to everyone else) = that the EWP will do the job all by itself. I'm already quite convinced that = it will, since I've tested it on the ground (at a voltage disadvantage no less). =20 Since I'm changing to Evan's, and expect a performance reduction in the cooling system already, it makes sense to run the system just like it = was first as a baseline, then try to find a way to test the EWP by itself. = The skeptics will be happy to know that it will be nice and hot by the time = I get around to such a test. =20 Bill Jepson (Still skeptical, But willing to listen.) It's a start :-) =20 Cheers, Rusty (imagining poor Leon beating his head on the desk) ------=_NextPart_000_00C9_01C52024.A1768DE0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Ok Rusty, Lets be clear here, the reason to run an = underdrive=20 pulley isn't to reduce FLOW. The reason is to prevent CAVITATION. This = is=20 dramatically different than trying to reduce flow.

The ads for the pulley's say they = reduce=20 wasted power, and reduce the chance of cavitation.  Perhaps the = only=20 significant advantage is the reduced chance of cavitation, but that's = not how=20 they're advertised. 

Since you are using the EWP as a backup (which seems a = sound=20 idea) you aren't sure it will do the whole job.

The best way to make me prove that = it will=20 work, is to keep telling me it won't :-)  

Seriously, I'm quite happy with my = current=20 system.  It's really the best of both worlds, but it would still be = valuable to prove (to everyone else) that the EWP will do the job all by = itself.  I'm already quite convinced that it will, since I've = tested it on=20 the ground (at a voltage disadvantage no less).  

Since I'm changing to Evan's, and = expect a=20 performance reduction in the cooling system already, it makes sense = to=20 run the system just like it was first as a baseline, then try = to find=20 a way to test the EWP by itself.  The skeptics = will be happy=20 to know that it will be nice and hot by the time I get around to such a=20 test.   

Bill Jepson (Still skeptical, But willing to = listen.)

It's a = start=20 :-)
 
Cheers,
Rusty = (imagining poor=20 Leon beating his head on the desk)
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