Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Fri, 18 Oct 2002 18:53:36 -0400 Message-ID: X-Original-Return-Path: Received: from corpprd-pxy2.canfor.ca ([198.162.160.3] verified) by logan.com (CommuniGate Pro SMTP 4.0b9) with ESMTP id 1831534 for flyrotary@lancaironline.net; Fri, 18 Oct 2002 13:33:43 -0400 Received: from exchange.canfor.ca (mail.canfor.ca [198.162.162.49]) by corpprd-pxy2.canfor.ca (Build 101 8.9.3/NT-8.9.3) with ESMTP id KAA00891 for ; Fri, 18 Oct 2002 10:31:41 -0700 Received: by exchange.canfor.ca with Internet Mail Service (5.5.2653.19) id <402SJ830>; Fri, 18 Oct 2002 10:33:26 -0700 X-Original-Message-ID: <42FD577DCE14D411B5860090273F466240FCAB@mailman.canfor.ca> From: "Bartrim, Todd" X-Original-To: "'flyrotary@lancaironline.net'" Subject: RE: [FlyRotary] Re: EWP Tech Data Take 1,000,000 ... X-Original-Date: Fri, 18 Oct 2002 10:33:32 -0700 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C276CC.7AAC66C0" This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01C276CC.7AAC66C0 Content-Type: text/plain > I'm not arguing about it working (I strongly believe it will work just > dandy), but I would like to know about failure modes. > > Do you get a redundant alternator? or a redundant water pump? > The most likely failure mode that I can imagine is a broken belt. With a mechanical pump, a broken pump belt means an instant loss of cooling. A broken alternator belt could also take out the pump belt, with the same results. Last nights tests showed that their is a significant reserve time without an alternator. And that was with the pump running at full power. At cruise speeds I would expect less current draw due to the controller slowing the pump. One observation I did make when I shut down the pump last night, was that the motor was quite warm. Not alarmingly hot, but enough that it was uncomfortable to hold your hand on it. All things mechanical can be expected to have a limited service life, often with degraded service preceding total failure. Electrical devices in theory should last indefinitely (excluding bearings), but in reality do not and usually give no warning of their failure. In the case of a broken belt, I feel this is a safer system. A spare pump could be used and still be lighter than the mechanical pump, however this may be a little excess. S. Todd Bartrim Turbo 13B rotary powered RX-9endurance (FWF) C-FSTB (reserved) http://www3.telus.net/haywire/RV-9/C-FSTB.htm ------_=_NextPart_001_01C276CC.7AAC66C0 Content-Type: text/html Content-Transfer-Encoding: quoted-printable RE: [FlyRotary] Re: EWP Tech Data Take 1,000,000 ...

    I'm not arguing about it working (I = strongly believe it will work just
    dandy), but I would like to know = about failure modes.

    Do you get a redundant alternator? or = a redundant water pump?

The most likely failure mode that I = can imagine is a broken belt. With a mechanical pump, a broken pump = belt means an instant loss of cooling. A broken alternator belt could = also take out the pump belt, with the same results.

        Last nights tests showed that their is a significant = reserve time without an alternator. And that was with the pump running = at full power. At cruise speeds I would expect less current draw due to = the controller slowing the pump.

        One observation I did make when I shut down the pump = last night, was that the motor was quite warm. Not alarmingly hot, but = enough that it was uncomfortable to hold your hand on it.

        All things mechanical can be expected to have a limited = service life, often with degraded service preceding total failure. = Electrical devices in theory should last indefinitely (excluding = bearings), but in reality do not and usually give no warning of their = failure.

        In the case of a broken belt, I feel this is a safer = system. A spare pump could be used and still be lighter than the = mechanical pump, however this may be a little excess.

S. Todd Bartrim
Turbo 13B rotary powered
RX-9endurance (FWF)
C-FSTB (reserved)
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

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