Bob Perkinson wrote:

The best fire suppression system is just plane water.  Before I
retired we replaced all of our CO2 fire suppression systems with high
press. water mist.  30 gal of water replaced 6 150# CO2 bottles.  The
idea is the water will spray out in a fine mist and instantly turn to
steam, this removes the heat from the combustion and also displaces
the air.  I know that displacing the air would be hard to do in a
moving aircraft but removing the heat would definitely put out the
fire if the mist were spraying on and in the area of the exhaust this
may prevent what ever fluid is leaking from re-combustion.  A high
press. water system big enough to be able to do this would be weighty
and take up a considerable amount of room (Water container + high
press. gas cylinder plus high press piping and spray nozzles.)  I am
not sure how to figure the  btu's stored in the exhaust system, but
fairly sure that it would be a function of the mass of the eshaust
system and the temp. of the metal, this would dictate how much water
would be neede to remove this heat.  Water would have to be kept above
freezing, this throws another kink in the logestics of this type of
system.
Somone out there may have an idea on this and how to make this a
practical system.

Bob P.

Most of us rotary guys already carry a water reservoir that is protected
from freezing.  If your engine compartment is on fire, you probably
won't be overly concerned with the internals of your engine getting to hot.

You just need a way to mist the water.  I suggest an unregulated fuel
pump into some metal tubing and out through three or four strategically
placed agricultural misting nozzles.

The cooling system only uses a few quarts, but how many do you need once
you cut the fuel supply?

-- http://www.ernest.isa-geek.org



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