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Mixing Fan Needed?

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Mixing Fan Needed?

Unread postAuthor: jsefcik » Mon Jul 18, 2011 7:37 pm

I have seen mutiple guns with mixing fans, I have seen multiple guns with out them and both guns work?

Do you need them or just make it easier for igntion?

My next cannon is going to be combustion, using propane and a fuel, that why im asking
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Unread postAuthor: ramses » Mon Jul 18, 2011 7:41 pm

It makes it easier to ignite, and drastically improves performance. Fans are not necessary, but are strongly recommended, especially for "advanced" designs.
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Unread postAuthor: jsefcik » Mon Jul 18, 2011 8:03 pm

I have one gun that im going to modify to do this with, But how much to put in psi with and ggdt thing didnt work once i down loaded it
I will rig up something to my gun to get the propane in.
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Unread postAuthor: irisher » Mon Jul 18, 2011 8:35 pm

If you are building a combustion gun you should not be using ggdt, you should try hgdt.
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Re: Mixing Fan Needed?

Unread postAuthor: MrCrowley » Mon Jul 18, 2011 9:24 pm

I know I've mentioned the SpudWiki to you several times before, but you really should look at it.

SpudWiki > Search "chamber fan" (or just fan):
http://www.spudfiles.com/spud_wiki/inde ... hamber_fan

I have seen multiple guns with out them and both guns work?

Do you need them [...] ?

You answered your own question there. No, you don't. As you've noticed, cannons will work without them.

or just make it easier for igntion?

From the Wiki: The fan will improve muzzle velocity, power and usability

I will rig up something to my gun to get the propane in.

Before you make a topic on that too:
http://www.spudfiles.com/forums/how-to- ... t7234.html
http://www.spudfiles.com/spud_wiki/inde ... Fuel_meter
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Unread postAuthor: Moonbogg » Mon Jul 18, 2011 11:56 pm

My first combustion has everything just about right, except it didn't have a fan. I made another one just like it but added a fan and I absolutely could not believe the difference. The power increased ridiculously.
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