Spray and pray + chamber fan= Fire

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SpudFiles Forum Index » Combustion Cannon Discussion » Spray and pray + chamber fan= Fire

Spray and pray + chamber fan= Fire

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sprayandplay08

Posted: 06/12/2008 12:48 PM Post subject: Spray and pray + chamber fan= Fire

Corporal

Joined: 09 Jun 2008
Posts: 63
2.11 Spud Bux

I put a chamber fan in my cannon and fired it and opened the cleanup to find a ball of flames that was my fan

TurboSuper

Posted: 06/12/2008 12:55 PM Post subject:

Brigadier General

Joined: 16 Jun 2005
Posts: 785
1273.63 Spud Bux

Looks like some fuel got stuck to the fan and ignited.

I guess some oxygen remains in the chamber after all...

I'll bet you were using hair spray or deodorant.

sprayandplay08

Posted: 06/12/2008 13:07 PM Post subject:

Corporal

Joined: 09 Jun 2008
Posts: 63
2.11 Spud Bux

i was using rightguard extreme deodorant[/u]

iisthemuffin

Posted: 06/12/2008 13:14 PM Post subject:

Lieutenant Colonel

Joined: 11 May 2008
Posts: 473
758.68 Spud Bux

i thought rightguard didnt work anymore?

well i mean you are using a COMBUSTION cannon...which means there is an EXPLOSION inside of the chamber...which will of course make a FIRE...and depending on where you got the fan from there could have been oil on it...or maybe you just sprayed onto the fan...its not too hard for that to happen

sprayandplay08

Posted: 06/12/2008 13:21 PM Post subject:

Corporal

Joined: 09 Jun 2008
Posts: 63
2.11 Spud Bux

my can of right guard extreme is over 1 yr old i never used until now

starman

Posted: 06/12/2008 13:31 PM Post subject:

Big Daddio
<b>Donating Member</b>

Joined: 11 Dec 2007
Posts: 1755
3637.09 Spud Bux

TurboSuper wrote:

Looks like some fuel got stuck to the fan and ignited.

I guess some oxygen remains in the chamber after all...

Or rushed in when the clean out was opened.

sprayandplay08 wrote:

my can of right guard extreme is over 1 yr old i never used until now

Hopefully, this isn't an indication of your hygienic habits in general.... Wink

sprayandplay08

Posted: 06/12/2008 13:53 PM Post subject:

Corporal

Joined: 09 Jun 2008
Posts: 63
2.11 Spud Bux

I'm allergic to the brand

psycix

Posted: 06/13/2008 4:07 AM Post subject:

Major General

Joined: 25 Jun 2007
Posts: 1830
291.34 Spud Bux

Normally a fan doesnt get up in flames. There was some fuel sticked to it and surprisingly enough there was enough oxygen left in the chamber to start a small fire.

Any pics? Very Happy

jimmy101

Posted: 06/13/2008 12:44 PM Post subject:

Major General

Joined: 28 Mar 2007
Posts: 1762
7467.36 Spud Bux

There wouldn't be enough oxygen left in the chamber to sustain a fire for more than a few milliseconds. What probably happened was you had liquid fuel (is there any ethanol or isopropanol in the rightgaurd?) one the fan and/or chamber walls. So the gun was overfueled. When fired, and at the instant the ammo exited the barrel, you had little if any oxygen left in the chamber but a small flame persisted somewhere. (EDIT: Or, you had a glowing ember.)

After the ammo left the barrel the hot combustion gases continue to expand until the chamber reached 1 ATM. The gases cooled as they expanded and continued to cool after you reached 1 ATM. The cooling gases in the gun collapsed and sucked fresh air in through the barrel. The fresh air plus the small residual flame fully ignited whatever the liquid fuel was.

If the gun is properly fueled this won't happen. Run the fan longer after fueling to get all the volatiles to vaporize. This probably means decreasing the length of time you spray in the fuel.

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