Return-Path: Received: from smtp2.netdoor.com ([208.137.128.155] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP-TLS id 2637068 for flyrotary@lancaironline.net; Tue, 14 Oct 2003 22:10:18 -0400 Received: from netdoor.com (port99.jxn.netdoor.com [208.137.132.99]) by smtp2.netdoor.com (8.12.10/8.12.1) with ESMTP id h9F2AFaX010275 for ; Tue, 14 Oct 2003 21:10:16 -0500 (CDT) Message-ID: <3F8CAC84.20605@netdoor.com> Date: Tue, 14 Oct 2003 21:10:12 -0500 From: Charlie & Tupper England Reply-To: cengland@netdoor.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: EWP - series pumps and wacky ideas References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0 X-Scanned-By: MIMEDefang 2.31 (www . roaringpenguin . com / mimedefang) Jim Sower wrote: >snip > >Next thing I would do is drive my coolant alert alarms with >coolant pressure. I believe that in case of primary failure, >the coolant pressure will start rising a good bit before the >temp [readings]. > >snip > >That's what I think .... Jim S. > It would be relatively trivial to design a circuit that uses current sensing to detect pump failure. Current to the pump that falls either above or below the design window can be used to trigger an alarm or activate the backup. Response would be nearly instant. Charlie