X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 20 Dec 2009 02:36:31 -0500 Message-ID: X-Original-Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.123] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTP id 4027797 for lml@lancaironline.net; Fri, 18 Dec 2009 12:03:45 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.123; envelope-from=super_chipmunk@roadrunner.com X-Original-Return-Path: X-Authority-Analysis: v=1.0 c=1 a=lYJFvZxstgHfxkktNeUA:9 a=JhlSwROvHbcUDr54wYbNeBNlgbUA:4 a=T09ue9nr3QBpBEvQZi8A:9 a=3L7vtOASJi_S71Kgu2AA:7 a=graa7qisDgXyzWMBQJ86BqR-F1oA:4 X-Cloudmark-Score: 0 X-Originating-IP: 74.75.176.139 Received: from [74.75.176.139] ([74.75.176.139:56642] helo=Laptop) by cdptpa-oedge02.mail.rr.com (envelope-from ) (ecelerity 2.2.2.39 r()) with ESMTP id 5A/44-04641-DC5BB2B4; Fri, 18 Dec 2009 17:03:09 +0000 X-Original-Message-ID: From: "Bill Wade" X-Original-To: "Lancair Mailing List" References: In-Reply-To: Subject: Re: [LML] Re: Firewall X-Original-Date: Fri, 18 Dec 2009 12:03:11 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_041A_01CA7FDA.11FAFD20" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18005 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18005 This is a multi-part message in MIME format. ------=_NextPart_000_041A_01CA7FDA.11FAFD20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Back when I was building one, engine fires were all too common in = Velocities. Detection becomes a real issue when the engine is behind you = and the aileron and rudder controls pass through the compartment with no = fire protection. Some of the thoughts I had: For sensing a fire, perhaps thermal fuses could be used. They're = available in a range of temperatures- I have ones rated at 144dC up to = 184dC. I imagine higher temps could be found easily. My thought is to = run them in series to different points within the engine compartment. = The loop would be connected to the winding of a relay, holding the = contacts open. If one of the fuses blew the relay would close and set = off the alarm. DC fire alarm components for hard wired systems might be another = option- either temperature or rate-of-rise. It also might be possible to = hard wire a battery-operated fire alarm as a sensor. -Bill Wade [Nomex = on..? :^) ] ------=_NextPart_000_041A_01CA7FDA.11FAFD20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
  Back when I was building one, = engine fires=20 were all too common in Velocities. Detection becomes a real issue = when the=20 engine is behind you and the aileron and rudder controls pass through = the=20 compartment with no fire protection. Some of the thoughts I = had:
 
  For sensing a fire, perhaps = thermal fuses=20 could be used. They're available in a range of temperatures- I have ones = rated=20 at 144dC up to 184dC. I imagine higher temps could be found = easily. My=20 thought is to run them in series to different points within the engine=20 compartment. The loop would be connected to the winding of a relay, = holding the=20 contacts open. If one of the fuses blew the relay would close and set = off the=20 alarm.
 
  DC fire alarm components = for hard wired=20 systems might be another option- either temperature or = rate-of-rise. It=20 also might be possible to hard wire a battery-operated fire alarm = as a=20 sensor.  -Bill Wade  [Nomex on..?  :^)=20 ]
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