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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..? :^)
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