pneumatic potato gun i made

[Schnabel]

One precaution I will give you is that we have been building many air cannons over the years and every time we used pvc because of the cost for supplies and every time we got screwed over. Basically you have to treat it like glass because it will crack slowly with the pressure built up inside and will being put down to the point that it can't be used anymore. You may want to consider using something else.

Originally Posted by Tytus Gerrish

90psi is nothing for a hand held gun i typically use co2 at about 850Psi. even with compressed air i go up around 250psi.

Just remember, the TechnoKats built a cannon this year and we can shoot into the crowd ~70+ ft. away at 50 psi.

[vivek16]

ok, I tried hot gluing a straw to the other end of the valve and i can shoot mini pellets like 50 feet now.

the pellets are about the size of mechanical pencil erasers. I think i will get a smaller tube ~ .5 in. in diameter and launch baby carrots

[Adama]

take all your questions to www.spudfiles.com

if they cant help you, no one can

[Tim Arnold]

Inline sprinkler valve is the answer for quick dumping of the tank. They work magic. We purchased plans from http://www.americanaircannons.com/plans.html for building a t-shirt launcher (yes its called a "launcher", not gun, shooter, or cannon, the school doesn't like that). The main bit of the project is a 3/4" or 1" in-line sprinkler valve, which has a manual control on the back and the solenoid (which is 24V AC) oddly works with 12V DC off of a spike.

Anyway, here is ours, attached to our 2005 rookie bot:

[John Gutmann]

Originally Posted by Tim Arnold

Inline sprinkler valve is the answer for quick dumping of the tank. They work magic. We purchased plans from http://www.americanaircannons.com/plans.html for building a t-shirt launcher (yes its called a "launcher", not gun, shooter, or cannon, the school doesn't like that). The main bit of the project is a 3/4" or 1" in-line sprinkler valve, which has a manual control on the back and the solenoid (which is 24V AC) oddly works with 12V DC off of a spike.

Anyway, here is ours, attached to our 2005 rookie bot:

It may just react quicker to a higher voltage.

-John

[Otaku]

For a Pneumatic gun (Which I don't have much experience with), you're going to want larger/more air tanks (plumb them together in a chain or such) and a sprinkler valve to release the pressure quickly.

Now, if you want help with a combustion potato cannon (check the legality first), then feel free to ask me as I've built two, a 3ft and a 7ft cannon.

[John Gutmann]

Originally Posted by Otaku

For a Pneumatic gun (Which I don't have much experience with), you're going to want larger/more air tanks (plumb them together in a chain or such) and a sprinkler valve to release the pressure quickly.

Now, if you want help with a combustion potato cannon (check the legality first), then feel free to ask me as I've built two, a 3ft and a 7ft cannon.

You don't want the tanks in a 'chain' you want them in parallel. This has already been covered earlier in the thread.

-John

[Otaku]

Originally Posted by John Gutmann

You don't want the tanks in a 'chain' you want them in parallel. This has already been covered earlier in the thread.

-John

Ah. Well, as I stated, I don't have experience with pneumatic systems for potato launchers.