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[DPRG] Extinguishing the FireFighting candle

Subject: [DPRG] Extinguishing the FireFighting candle
From: Mike McCarty jmccarty at ssd.usa.alcatel.com
Date: Mon Feb 4 11:09:29 CST 2002

On Sun, 3 Feb 2002, Kipton Moravec wrote:

> Directing the spray is the big problem with water as you can see.
> My concern with water is that you have to use a lot of it and have a direct
> hit to be effective.
> While it is allowed, it does cause a mess for the judges to clean up between
> contestants.
> How about a "sonic" blast?
> I remember when I was in cub scouts, we took an old oatmeal container, cut a
> dime size hole in the top. The rest was sealed. By flicking your finger on
> the bottom, the big bottom forced a burst if air out the small hole.  I
> wonder if something along that principle can be implemented.  Maybe with a
> speaker.  Seal one side to a cone and have a small opening that you point at
> the flame.  Changing polarity of the speaker should make it travel the
> longest distance.  It may be enough to put out the candle.
> I don't know if it will work, but it is a brainstorming idea for something
> different.
> Kip

These are called "vortex rings", and they can indeed put out fires.
Anyone remember the toy called the air blaster? Fabulous toy! That would
have been in about 1963 or 1964.

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