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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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 Posted: Thu Mar 09, 2006 10:45 am Post subject: FWF fire annunciator (was market research) |
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In a message dated 3/9/06 12:05:00 PM Central Standard Time,
sportav8r(at)aol.com writes:
| Quote: | On a serious note, how about a FWF fire annunciator?
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Has anyone considered or tried a thermocouple centered on the cowl outlet to
monitor air temp? An AUX channel on EIS could monitor sensor with upper limit
setting at some value above normal ops to possibly serve this purpose...
Mark do not archive
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sportav8r(at)aol.com
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| Posted: Thu Mar 09, 2006 11:00 am Post subject: FWF fire annunciator (was market research) |
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My thought s have been toward a combo of overtemp sensor (as you suggest), either in series or parallel with an arrangement where a cotton thread holds open a spring-loaded N.C. plunger-type microswitch. In theory, the flame parts the thread and closes the switch, whereas high temps alone would not trip it. Cotton thread would probably be a frequent replacement item, though, in that oily, hot, and vibration-filled environment, and easily broken during engine maintenance chores. I have not installed anything like this in my RV, but have given it some thought.
-Bill B
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rvbuilder(at)sausen.net
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| Posted: Thu Mar 09, 2006 1:07 pm Post subject: FWF fire annunciator (was market research) |
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Someone mentioned this once before (Eric maybe) but you could use one of these puppies for flame detection.
<http://www.superdroidrobots.com/shop/item.asp?itemid=3D121>
Michael Sausen
RV-10 #352 Working on Fuselage
Do Not Archive
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Dan.Beadle(at)hq.inclines
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| Posted: Thu Mar 16, 2006 8:18 am Post subject: FWF fire annunciator (was market research) |
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This is basically how fire bottle systems work. They have a fixed temp
switch placed in various areas of the engine compartment. Most trigger
around 430 degrees - well hotter than a hot cylinder. In my airplane
they are aft of the cylinder baffles.
Generally, monitoring ambient is a good way to detect fire.
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mark(at)stratologic.net
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| Posted: Thu Mar 16, 2006 10:56 am Post subject: FWF fire annunciator (was market research) |
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My engine monitor uses dallas one wire temperature sensors on a bus that you
can scatter around the plane... i keep one in the engine compartment with an
alert set at the max temp the sensor supports....125C or 257F. I usually
see temps (just behind my plenum about 6" and in free air) at about
125-140F....
nice thing is that you can plug and play the sensors since they are
recognized at engine monitor startup.
i dont know if i would make this an automatic system....but would hook up
the extinguisher to a switch that can be turned on once the alert from the
sensor is triggered and you get a voice annunciation in the headset....so
there is a human in the loop...and no unwanted halon discharge.
you can see some details at www.stratologic.net.
cheers,
Mark.
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