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Spud Gun Science Fair Project

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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Spud Gun Science Fair Project

Unread postAuthor: SwissSpudGunner » Tue Dec 05, 2006 8:52 pm

So I need some ideas to turn my spud gun into a science experiment. I have a combustion cannon. I use hairspray as a fuel.The gun is made out of schedule 40 PVC, PVC primer and cement. Here it is.

2) The spud gun uses 1.5-in.-dia. pipe for the barrel. It is connected via a 1.5 x 4-in. bushing and a coupler to a 10-in. length of 4-in. pipe (the combustion chamber) That pipe is linked to a cleanout adapter and endcap (which is removed to add fuel).

3) A grill igniter is wired to a pair of machine screws that extend through the combustion-chamber wall.

That's it. Hope you can Help.

-SwissSpudGunner
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Unread postAuthor: djt » Tue Dec 05, 2006 9:02 pm

Since usually science fair experiments are supposed to be more controlled, i would upgrade to metered propane. With that you could do something with amount of fuel vs. velocity or distance. You could also do something with ammo shape and distance/accuracy.
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Unread postAuthor: schmanman » Tue Dec 05, 2006 9:10 pm

How about everything djt said, but testing ammo penetration instead?
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Unread postAuthor: pyrogeek » Tue Dec 05, 2006 9:30 pm

Then you can make a comment in your project about how you are after deep penetration. And just act all confused when someone points it out, then call them a pervert.
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Unread postAuthor: pyromanic13 » Tue Dec 05, 2006 9:34 pm

I amde a thread on this... do a search. (I'll save you some trouble) I tested how to make good body armor useing Dilatant substances... I even wrote up a procedure and pasted it one here..
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Unread postAuthor: King_TaTer » Tue Dec 05, 2006 9:37 pm

first of all, welcome to the forums swissspudgunner. I think maybe for your science fair project you could demonstrate shooting nonharmful projectiles into the air and/or at a target to demonstrate the power and the physics involved. :D
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Unread postAuthor: boilingleadbath » Tue Dec 05, 2006 10:23 pm

There is at least one thread here which discusses the construction of home-made cronographs. (see if you can find them... I don't feel like it)

I'm sure you can think of something interesting to do with those numbers. Maybe you could do a repeat of the latke tests?
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Unread postAuthor: SwissSpudGunner » Wed Dec 06, 2006 11:22 am

thank you everyone. your input is very helpful. if you think of anything else i would be very thankful if you could share it with me. thanks again.

-SwissSpudGunner
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Unread postAuthor: redneck2882 » Tue Oct 25, 2011 7:05 pm

did you test the penitration because im thinking about testing it for mmy science fair :arrow:
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Unread postAuthor: Technician1002 » Tue Oct 25, 2011 7:31 pm

Build a magnetic chronograph and use a sound card to record a series of shots. Find the best fuel air ratio. Repeat for different mass projectiles to see if lighter projectiles benefit from rich or lean mixtures compared to heavy projectiles. Does a heavy projectile benefit from a rich mix for a slower burn and a light projectile from a leaner burn?

First have a hypothesis, then design an experiment to prove your theory, run the experiment, analyze the result, and write a conclusion to your study.

Science fairs are designed to encourage scientific reasoning. Use that, or yoru project won't gain many points.
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Unread postAuthor: SpudBlaster15 » Tue Oct 25, 2011 9:56 pm

I think it's pretty safe to say that the OP's science fair has long since ended, given that this thread was posted nearly 5 years ago.
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Unread postAuthor: warhead052 » Tue Oct 25, 2011 9:57 pm

Uh, I hope you guys realize this was last posted in 2006... Talk about bumping.
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