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From: "Bob Perkinson" <bobperk@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Fire extinguishers
Date: Tue, 23 Aug 2005 21:55:51 -0500
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Importance: Normal

There is a product out there called protecto wire that will melt at a
predetermined temp that could be used in the engine compartment to alert of
higher than normal temps.

Bob Perkinson
Hendersonville, TN.
RV9A N658RP Reserved
If nothing changes
Nothing changes


There was a recent thread on the Aerolectric list that discussed
detection techniques. Infra-red detectors were recommended, and they're
supposed to be fairly cheap and will feed into one of those miniature
monitors so that you can see what is happening.  In my opinion, it's
more weight and complexity than it's worth.

I didn't like the first idea that was offered; run a twisted pair of
thin wire all around the engine compartment.  The theory is that a fire
will burn through the insulation, shorting the wires and tripping an
alarm.  My theory is that the wires would get oxidized and covered in
melted plastic before they could short, preventing a good contact and
defeating the alarm.  I would modify the design to be a single wire of
the thinnest possible gauge, made from that cheap twisted aluminum stuff
instead of real copper.  It would always be powered when the engine was
running, and if anything cut the wire for any reason an alarm would go
off.  I'd have no idea what cut the wire, but I'd know something was
amiss, be it a fire or parts leaving the engine.  Either way the alarm
would mean, "Get on the ground. NOW!!"  I'm going on the assumption that
the death rate on precautionary landings is very low.

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