Return-Path: Received: from frontend3.cwpanama.net ([201.225.225.169] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 521762 for flyrotary@lancaironline.net; Sun, 07 Nov 2004 16:12:38 -0500 Received-SPF: none receiver=logan.com; client-ip=201.225.225.169; envelope-from=rijakits@cwpanama.net Received: from [201.224.93.110] (HELO usuarioq3efog0) by frontend3.cwpanama.net (CommuniGate Pro SMTP 4.2.1) with SMTP id 29706944 for flyrotary@lancaironline.net; Sun, 07 Nov 2004 16:24:21 -0500 Message-ID: <001f01c4c50e$3e97b440$6e5de0c9@usuarioq3efog0> From: "rijakits" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EWP Date: Sun, 7 Nov 2004 16:10:43 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001C_01C4C4E4.553C2890" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2741.2600 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2742.200 This is a multi-part message in MIME format. ------=_NextPart_000_001C_01C4C4E4.553C2890 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Sunday, November 07, 2004 12:05 AM Subject: [FlyRotary] Re: EWP maybe I missed it, but for what reason would you want to run electric = waterpumps? - no cavitation at high rpm - better cooling at low rpm (holding for takeoff, etc) - more power available for the prop, particularly at higher rpm's = (remains to be proven how much more) - reliability (broken and throw belts are the only thing that's EVER = stranded me in a car, happened twice) - easier, more flexible installation - redundancy (ever seen two mechanical pumps) - other advantages I'm too tired to think of at the moment. For the record, I'm pretty happy with my series mechanical and EWP = setup. It's sort of like having the best of both worlds. The only = reason I'll go full EWP is if I can prove that there's significant = performance to be gained. Frankly, I'll be surprised if I can tell any = RPM difference between mechanical, and EWP runs. =20 Cheers, Rusty Rusty I don't see, how more cooling flow at low rpm will cool better, = there is still no change in radiator-size/airflow/etc. no cavitation at high rpm: use underdrive pulleys and maintain the belts in correct alignmentand tension and you will = never loose one..........:) Thomas Jakits (I have abour 5000 hrs flying time in front of belts double-v-typ as = the only means of powertransfer from the engine to the rotor....) ------=_NextPart_000_001C_01C4C4E4.553C2890 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
 
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Sunday, November 07, 2004 = 12:05=20 AM
Subject: [FlyRotary] Re: = EWP

maybe I missed it, but for what reason = would=20 you want to run electric waterpumps?
 
- no=20 cavitation at high rpm
- better=20 cooling at low rpm (holding for = takeoff, etc)
- more=20 power available for the prop, particularly at higher = rpm's (remains to=20 be proven how much more)
- reliability (broken and throw belts are the = only thing=20 that's EVER stranded me in a car, happened=20 twice)
-=20 easier, more flexible installation
-=20 redundancy (ever seen two mechanical pumps)
- other=20 advantages I'm too tired to think of at the = moment.
 
For the=20 record, I'm pretty happy with my series mechanical and=20 EWP setup.  It's sort of like having the best of both = worlds. =20 The only reason I'll go full EWP is if I can prove that there's = significant=20 performance to be gained.  Frankly, I'll be surprised if I = can tell=20 any RPM difference between mechanical, and EWP=20 runs.  
 
Cheers,
Rusty
 
 
 
 
Rusty I don't = see, how more=20 cooling flow at low rpm will cool better, there is still no change in=20 radiator-size/airflow/etc.
no cavitation at = high rpm:=20 use underdrive pulleys
and maintain the = belts in=20 correct alignmentand tension and you will never loose=20 one..........:)
 
Thomas=20 Jakits
(I have abour = 5000 hrs flying=20 time in front of belts double-v-typ as the only means of powertransfer = from=20 the engine to the rotor....)
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