Large flame?

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Postby risc19 » Tue Jan 16, 2007 12:06 pm

Hello all!

I have a couple of successful combustion cannons and I was wondering the best way to get a large mussel flash out the end?
This is purely for looks so it doesn't actually need to have a projectile in the barrel (if that might help).


Any ideas fellas? ;)
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Postby TurboSuper » Tue Jan 16, 2007 12:08 pm

Just use a very large chamber with a small barrel.
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Postby Freefall » Tue Jan 16, 2007 12:31 pm

Like TurboSuper said, just use a large chamber with a small barrel. In addition, set your mixture on the rich side.

Now:
Do you want a flame or a fireball?
If you put the ignition near the breech, you'll get a flame.
If you put the ignition as far from the breech as possible, you'll get a fireball.
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Postby BigBang » Tue Jan 16, 2007 1:22 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote"><b>Originally posted by Freefall</b>
[br]If you put the ignition near the breech, you'll get a flame.
If you put the ignition as far from the breech as possible, you'll get a fireball.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Could you clarifiy this a bit for me. I'm not sure I follow. I too have thought of making some 4th of July noise & flame makers myself.

Thanks.
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Postby Freefall » Tue Jan 16, 2007 1:41 pm

If you put the ignition at the breech, you'll be blowing hot combustion gases out the muzzle, thus a flame.
If you put the ignition as far from the breech as possible, you'll blow out a cloud of combustible gases, followed by the flame front, thus a fireball.
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Postby risc19 » Tue Jan 16, 2007 4:09 pm

Cool, thanks for your input guys!
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Postby BigBang » Wed Jan 17, 2007 4:55 pm

Ah, yes. I get it now. However, I've always just seen flames shoot out of the end of my barrels, and I tend to put the igintion point rearward. I suspect that with longer chambers this effect would be more pronounced.

I guess I was thinking of "fireball" something like in one of Joel's thunderpipe videos.
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Postby spuzi14 » Wed Jan 17, 2007 8:49 pm

Is this going to show up during the day?
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Postby TurboSuper » Thu Jan 18, 2007 6:36 am

Fuel choice is also going to make a difference. Propane would make a nice blue flame. The flammable components in aerosol may give you a slightly longer red flame.
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Postby mik » Wed Feb 28, 2007 6:11 am

This could generate a short, strong flame.
change a shot barrel. 5cm-20cm. stuck a block of dry paper in the barrel and make sure it stucked tight and will move out only when gas presure reach half of device's max presure limit.
if your barrel is too big for stuck a block of dry paper. You will need a powerful mixture. like 02+C4H0.
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