Marble cannon

A place for general potato gun questions and discussion.
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HighCommander4
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I have to build a marble cannon for a physics project and I am wondering what type of design should I choose? Springs? Maybe compressed air? Perhaps a catapult-like mechanism? (I'm not allowed to use fuels or explosives).

Any suggestions are greatly appreciated.
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singularity
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definately pnuematic (compresed air) heres some plans for a paintbal gun i stumbled across, just change the barrel size and your good to go!

<img src="http://i78.photobucket.com/albums/j85/i ... img006.jpg">

side note: you do realize this is more or less a "gun" so you might want to check to make sureyou can bring it to school, and what are you studing, ballistix?
be sure to check out my <a href="http://www.spudfiles.com/forums/ak-styl ... 9.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
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Flying_Salt
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So you were assigned to build a marble gun? I'd look around and ask around for a good design for a nice little pneumatic marble gun.
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Brian the brain
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http://www.spudfiles.com/forums/viewtop ... sc&start=0&

That will make an impression, trust me
Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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rna_duelers
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Haha putting tabs on yourself there BTB.Just go with a simple design with a ball valve and some fittings cheap and effective.
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