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Posted by David Lesher on December 31, 2010, 11:54 pm
 



Powder makes a terrible mess, but less so than toasted corpses do.....
it really is magic for burning liquids such as fuel oil/gasoline/etc.

CO2 extinguishers are downplayed by firefighter types...they
don't work well at all outdoors, etc.


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Posted by clare on December 31, 2010, 8:53 pm
 
On Fri, 31 Dec 2010 13:28:32 -0500, "vaughn"


Besides the mess, a standard dry chemical extinguisher is not going to
be nearly as effective as a CO2, and will definitely require an engine
teardown (adviseable after a run-away in any event - but a lot messier
when filled with powder.)

Posted by Rich Grise on December 31, 2010, 11:05 pm
 vaughn wrote:

At this point, isn't that kinda moot? ;-)

Cheers!
Rich


Posted by clare on December 31, 2010, 8:51 pm
 On Fri, 31 Dec 2010 18:12:28 +0000 (UTC), David Lesher


 It better be a BIG CO2 extinguisher though. A 671 wound up is 750cfm
at 3000 RPM at atmospheric - at least double that through the blower,
so you need a good 1500 cu ft of CO2 to be sure you are going to bring
it to a halt - and a runaway g71 will be a lot more than 3000 RPM -
more like 6000, so at least 3000 CU ft of CO2 available to the intake.
Thats something like 400 POUNDS of CO2 (based on 556 cu meters per
tonne at 70F and 1 atmosphere)(15012 cu ft/tonne)(6.23 cu ft/lb)
Based on information from
http://www.icbe.com/carbondatabase/CO2volumecalculation.asp

OK, so you don't need 100% CO2 charge to stop the engine - but suffice
it to say a 25 pounder isn't going to cut the mustard . The engine
will progressively slow down, inhaling less CO2 as it slows down, so
I'd say a 50 lb or 2 25lb extinquishers would be MINIMUM to have
available if you are counting on killing a runaway 6-71 (426 cubic
inch displacement 2 stroke)



Posted by clare on December 31, 2010, 9:12 pm
 On Fri, 31 Dec 2010 18:12:28 +0000 (UTC), David Lesher


 I've seen a pair of coveralls go through a runaway deisel before the
chunk of steel plate slapped over the intake finally did the job.
It was a six cyl turbo deisel - not sure of the make or model as it
was something like 30 years ago.

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