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Big Bertha Air Cannon

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: Lentamentalisk » Sat Mar 01, 2008 9:22 pm

@potatoflinger:
A triggered burst disk would be terrible for this. The entire reason for him using the sprinkler valves is that they open slowly enough, and he can time them, so as to have a gradual increase in pressure, to not rupture the balloon. A burst disk cannon would obliterate a balloon... The real increase would come from more timed valves, or a much longer barrel.
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Unread postAuthor: pizlo » Sat Mar 01, 2008 9:23 pm

bluerussetboy wrote:short and thick does the trick :D

GAGHH why did you put that image in my mind!
damn you! you chodechomper!
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Unread postAuthor: ericthepoolboy » Sat Mar 01, 2008 10:04 pm

The tank is so huge because I got it for free on craigslist, and he who has the biggest wins ;). As for all the valves, what do you guys mean my modding them?

The barrel is the length it is because of the ease of transporting it. I have another 20' section of 4" PVC that will attach to the end of the existing barrel. The barrel can also be changed out for a different size since it is threaded into the manifold using a 2.5" male adapter.

As for moving this thing, the original plan was to make it a tow behind with a hitch and everything but that would have required highway rated tire and it just wasn't worth it. The day that we had to move it I loaded it up in my lifted truck and headed down the freeway. The amount of heads we turned was ridiculous.

And I love the comments guys. If you guys have any more idea for improvement i would love to hear them.
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Unread postAuthor: MrCrowley » Sat Mar 01, 2008 10:18 pm

This is a guide on <A HREF="http://www.spudfiles.com/forums/modding-a-sprinkler-valve-t305.html">modding</a> a sprinkler valve.

When you don't need it to shoot water balloons anymore and you want performance, then you could stick a far better valve on it, like a piston or burst disk valve. And you would only need one valve if it's big enough, not 6 :wink:
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Unread postAuthor: potatoflinger » Sat Mar 01, 2008 10:51 pm

Lentamentalisk wrote:@potatoflinger:
A triggered burst disk would be terrible for this. The entire reason for him using the sprinkler valves is that they open slowly enough, and he can time them, so as to have a gradual increase in pressure, to not rupture the balloon. A burst disk cannon would obliterate a balloon... The real increase would come from more timed valves, or a much longer barrel.


I meant after the contest was over and he wasn't launching water balloons any more.
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Unread postAuthor: jr » Sat Mar 01, 2008 10:55 pm

erick you have no clue what kind of monster you have built....... with that much air you could do all kinds of mass destruction. Modd your valves... you'll be glad you did! :twisted:


All in all that is one awsome cannon. And I am verrrry jealous!!!!!!
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Unread postAuthor: Eddbot » Sun Mar 02, 2008 1:32 am

that thing is like a piece of artillery, very nice :)
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Unread postAuthor: kablooie » Sun Mar 02, 2008 2:47 am

Wow, that cannon is BEASTLY. Very professional, with a longer barrel it would be even more insane, although the problem of where to shoot can be a big one. I have the same problem (on a smaller scale). What happens if you get pulled over with that in the back? lol.
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Unread postAuthor: ericthepoolboy » Sun Mar 02, 2008 3:04 am

Getting pulled over while transporting it was one of my biggest fears so we tarped it and took the barrel off the first time but decided to just show it off to the world the second time. I still wonder what a cop would say if I was to get pulled over with that in the back of the truck and the barrel sticking out 5' from the end of my bed.
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Unread postAuthor: Thursto » Sun Mar 02, 2008 4:34 am

WOW very nice indeed!!!

i like the looks of all the valves, you should have it the whole way down the tank :twisted: like 6-7 valves on each side :twisted: :D so you'd have 12-14 valves :evil2:

that would be totaly INSANE!

but the way it is now its just INSANLEY MASSIVE!!!!

i really like this thing!!

great paintjob and control box adds a great touch(s)

power would signifacanty increase if you had a longer barrel. But with a piston :S i dont know, i've never heard of a 6" pressure rated piston.

~ Thurston

PS. DAMAGE PICS/VIDS!!!!
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Unread postAuthor: frankrede » Sun Mar 02, 2008 1:39 pm

This cannon could be easily modified for better performance valve wise, while still retaining electronic ignition.
You would have to mod the valves and use 1/2" or 3/4" sprinkler valves as pilots and use the solenoids on those valves for your electronics.
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Unread postAuthor: ispudder » Sun Mar 30, 2008 11:55 am

which button is the FIRE button? :D
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Unread postAuthor: MaxuS the 2nd » Sun Mar 30, 2008 12:05 pm

Did you read the original post?

There are 6 individual buttons, he can either press individual ones at a time, or as imagine..He can set it to fire all at the same time.
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