Return-Path: Received: from mail04.syd.optusnet.com.au ([211.29.132.185] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP-TLS id 814434 for flyrotary@lancaironline.net; Mon, 21 Mar 2005 16:58:26 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.132.185; envelope-from=lendich@optusnet.com.au Received: from george (d220-237-192-190.dsl.nsw.optusnet.com.au [220.237.192.190]) by mail04.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j2LLvaZk008453 for ; Tue, 22 Mar 2005 08:57:38 +1100 Message-ID: <003f01c52e61$6dc946e0$bec0eddc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Under driven waterpump pulley Date: Tue, 22 Mar 2005 08:00:43 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003C_01C52EB5.3F044590" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_003C_01C52EB5.3F044590 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Kelly, I for one would be interested in that information. Are you saying that the standard underdrive pulley ( I guess 15% to 20%) = most commonly used is 5"? George (down under) Georges, Ed and all interested, The following excerpt from Bill Jepson adds more info about the stock = waterpump and would seem to show the wisdom of reducing pump RPM for those of us = using Tracy's RD1C 2.85 redrive.......I will be ordering the 5 " diameter pump = pulley today and when=20 received will report on quality, fit, etc as necessary for our = needs......=20 -- Kelly Troyer=20 Dyke Delta/13B/RD1C/EC2=20 (Copied and pasted from eariler post) Jim, I agree that 12-34 GPM is a big window. One of the items that = always drove my skecptisim over the EWP is that in almost every = thermodynamic text I've read turbulent flow is cited as helpful to heat = transfer. This would be short of cavitation of course. Volume is always = the second item, or sometimes interchangeable. I'm sure this is what = drives the "other list's" refusal to believe the EWP will work. I AM = willing to accept a actual test. Thanks Todd Leon and whoever has tried. = Somewhere there is an incorrect assumption being made. I'd like to know = where, so I'd be more comfortable, but I am always willing to believe my = eyes, and my temperature guage! As a side item, when I spoke with Steve = Wienzerl the designer of the newer PowerSport reduction drive, he said = they tested the EDWP to max flow. The claimed volume was 55 GPM = somewhere between 6500 and 7000 RPM. He was sure this was on the ragged = edge of caviitation. He wasn't a EWP believer, in fact he wanted even = more flow than they were getting!=20 Bill Jepson -------------- Original message from "Ed Anderson" = : --------------=20 Hi Georges, Not Tracy, but my alternator is underdriven by approx 40%. I have = two Racing beat pulleys each 20% underdriven, one the main pulley on the = eshaft and the other on the alternator. Kelly is looking into a = underdriven pulley for the water pump. Running continuos at above 5000, = even 6000 rpm make me decide to reduce the alternator speed and I would = like to do the same for the water pump especially with engine rpms = approaching 7000 rpm with the 2.85 redrive. I also use the best V belts = I can find (Gates) which I change every two years and they have never = shown any signs of stress such as cracks or grazing. Can not say the = say of some cheaper belts I used in the past, including one which after = 5 flights had the rubber "clogs" falling off the belt. Ed Anderson -------------------------------------------------------------------------= ----- >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_003C_01C52EB5.3F044590 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Kelly,
I for one would be interested in that=20 information.
Are you saying that the standard = underdrive pulley=20 ( I guess 15% to 20%) most commonly used is 5"?
George (down under)
 
Georges, Ed and all interested,
 
The following excerpt from Bill Jepson adds more info about the = stock=20 waterpump and
would seem to show the wisdom of reducing pump RPM for those = of us=20 using Tracy's
RD1C 2.85 redrive.......I will be ordering the 5 " diameter = pump=20 pulley today and when
received will report on quality, fit, etc as necessary for = our=20 needs...... 
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2 =
(Copied and pasted from eariler post)

Jim, I agree that 12-34 GPM is a big window. One of the items = that always=20 drove my skecptisim over the EWP is that in almost every thermodynamic = text=20 I've read turbulent flow is cited as helpful to heat transfer. This = would be=20 short of cavitation of course.  Volume is always the second item, = or=20 sometimes interchangeable. I'm sure this is what drives the "other = list's"=20 refusal to believe the EWP will work. I AM willing to accept a actual = test.=20 Thanks Todd Leon and whoever has tried. Somewhere there is an = incorrect=20 assumption being made. I'd like to know where, so I'd be more = comfortable, but=20 I am always willing to believe my eyes, and my temperature guage! As a = side=20 item, when I spoke with Steve Wienzerl the designer of the newer = PowerSport=20 reduction drive, he said they tested the EDWP to max flow. The claimed = volume=20 was 55 GPM somewhere between 6500 and 7000 RPM. He was sure this was = on the=20 ragged edge of caviitation. He wasn't a EWP believer, in fact he = wanted even=20 more flow than they were getting!
Bill Jepson


--------------=20 Original message from "Ed Anderson" = <eanderson@carolina.rr.com>:=20 --------------

Hi = Georges,
 
Not Tracy, but my = alternator is=20 underdriven by approx 40%.  I have two Racing beat pulleys each = 20%=20 underdriven, one the main pulley on the eshaft and the other on the=20 alternator.  Kelly is looking into a underdriven pulley for the = water=20 pump.  Running continuos at above 5000, even 6000 rpm make me = decide to=20 reduce the alternator speed and I would like to do the same for the = water=20 pump especially with engine rpms approaching 7000 rpm with the 2.85=20 redrive.  I also use the best V belts I can find (Gates) which = I change=20 every two years and they have never shown any signs of stress = such as=20 cracks or grazing.  Can not say the say of some cheaper belts I = used in=20 the past, including one which after 5 flights had the rubber "clogs" = falling=20 off the belt.
 
 
 
Ed = Anderson
 

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