X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail12.syd.optusnet.com.au ([211.29.132.193] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTPS id 986955 for flyrotary@lancaironline.net; Tue, 07 Jun 2005 01:25:56 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.193; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-73-161.dsl.nsw.optusnet.com.au [220.236.73.161]) by mail12.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j575P5qV009322 for ; Tue, 7 Jun 2005 15:25:07 +1000 Message-ID: <002301c56b21$fb55e390$a149ecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EC2 dual power feeds Date: Tue, 7 Jun 2005 15:30:13 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0020_01C56B75.CC76F1A0" 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_0020_01C56B75.CC76F1A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable In order to have truly redundant EC2s would require a 3rd CPU to monitor = the two controllers and automatically switch the failed unit off. Then = what is going to monitor the 3rd computer? Wendell As a little side interest the guys at Mistral are using a computer = that does exactly that. That is, it automatically switches between = computers at failure. Expensive but nice for certification. There is a = test circuit that checks BOTH ecu's before startup. Bill Jepson Bill, That's a great feature - I'm sure Tracy will get there eventually. I think Mistral's is 3 or 4 thousand dollars? George ( down under) ------=_NextPart_000_0020_01C56B75.CC76F1A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
In order to=20 have truly redundant EC2s would require a 3rd CPU to=20 monitor the two controllers and automatically switch the failed = unit=20 off.  Then what is going to monitor the 3rd=20 computer?
Wendell
As a little side interest the guys at Mistral are using a = computer that=20 does exactly that. That is, it automatically switches between = computers at=20 failure. Expensive but nice for certification. There is a test circuit = that=20 checks BOTH ecu's before startup.
Bill Jepson
 
Bill,
That's a great feature - I'm sure Tracy will get there = eventually.
I think Mistral's is 3 or 4 thousand dollars?
George ( down = under) 
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