Jesus wept. By your logic, halon could never put out a fire in the
open. A jet engine is basically a tube, open at both ends with a few
minor obstructions called turbine and compressor blades, in the way.
Once airborne there is a fair breeze blowing through it. Halon is
regarded as effective which is why it is standard equipment on jet
airliners for both engines and freight compartments.
So how do you explain this: http://www.hartindo.net/af11e.html Seems
to put out open fires quite well. It is a halon equivalent as is made
clear. I couldn't get a reply from these guys unfortunately. If you
have a fire that large in the engine bay things have truly got out of
hand. A decent halon extinguisher system may have had a chance to
prevent the tragedy with the Stemme a few years ago in Sydney.
Dry powder has its problems as there are cases where you may be on
the ground and have a fire on startup. You aren't in much immediate
danger if you evacuate the aircraft promptly (as Carol's instructor
said about startup engine fires, take steps, large and fast ones away
from the aircraft). Fire suppression isn't just for saving lives, it
is also to prevent economic loss. Wrecking what you put out only
prevents further loss to nearby equipment.
Here's a wikipedia article on fire extinguishers.
http://en.wikipedia.org/wiki/Fire_extinguisher More than you
wanted to know. I know it's wikipedia but the subject is fairly non
political and the article looks sensible. Looks to me like halon is
about as good as anything on general combustibles around the house
and flammable liquids and gases. Same thing really as petrol doesn't
burn, the vapour is what burns. The new halon replacements all seem
to use at least twice as much mass for the same effect.
On toxicity: The old freon refrigerant was only toxic to the extent
that it displaced oxygen. There was a picture in Scientific American
of a mouse walking around in a fish tank of freon liquid with oxygen
dissolved in it some years ago. This a way of making people resistant
to extreme g loads too. The replacement refrigerant has caused death
at 4000 ppm.
Mike
At 12:13 PM 14/01/2013, you wrote:
1. Re: FireWire fire detection wire. (DMcD)
yeah but I re-iterate (against Mike's suggestion) Halon -or any
other gas based retardant- will NOT put out an engine fire if the
engine is extended, much less so if it is running.
It will work fine if the bay doors are shut and / or there is a
limited area -as Mike said, within an jet engine housing works OK-
but not out in the breeze.
+1 BCF only option, sorry
_______________________________________________
Aus-soaring mailing list
[email protected]
To check or change subscription details, visit:
http://lists.internode.on.net/mailman/listinfo/aus-soaring
Borgelt Instruments - design & manufacture of quality soaring
instrumentation since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
_______________________________________________
Aus-soaring mailing list
[email protected]
To check or change subscription details, visit:
http://lists.internode.on.net/mailman/listinfo/aus-soaring
