Mailing List lml@lancaironline.net Message #53947
From: Colyn Case at earthlink <colyncase@earthlink.net>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] Re: Firewall
Date: Mon, 21 Dec 2009 12:21:15 -0500
To: <lml@lancaironline.net>
I like the specific region approach.  early is better.  somebody must make a multi-zone temp head that would work well.   I happened to have an excess edm-700 so that is what I used. (6 probes).  it is amazing how "local" some issues can be, prior to ignition.   ....and if you can find it prior to ignition, that's a good thing.
 
If anyone is interested in the temp sensing tapes, one product is at
 
I used these to measure temps in the exhaust tunnel  after acquiring an exhaust pipe that guided the exhaust somewhat closer to the fuselage.  they worked well but they only go to 500 dF.   Google search found some other similar products.   Maybe they go higher.
----- Original Message -----
From: Bill Wade
Sent: Monday, December 21, 2009 8:36 AM
Subject: [LML] Re: Firewall

  I agree- finding a suitable temperature range in a specific location would be difficult with the engine changing temperatures constantly as loading varied and cooling airflow changed. The outlet would show any increase no matter what the source.
 
  I'm thinking about point sources like exhaust joints or turbochargers affecting nearby hoses. There are temperature indicating tapes that could be placed to determine what the normal temperatures might be. It might be possible to choose a fuse that would blow when the hose first became exposed rather than allowing failure to create an alarm at the outlet.  -Bill
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