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My first large 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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Is it cool?

Yes!
0
No votes
No, of course not all I care about is efficiant valves and damage and I eat poo.
12
100%
 
Total votes : 12
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Unread postAuthor: DYI » Sat Feb 23, 2008 10:28 pm

Nova, as much as I hate to rain on your parade, with the exact specs he quotes, assuming 100ms opening (slow because it's a PVC BV), the 72" barrel, and a 200 gram projectile with a drag coefficient of 0.5, GGDT predicts exactly 800 feet.
Almost uncanny, isn't it?

With a 20' barrel he'd roughly double the range, which really isn't worth it.
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Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
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Unread postAuthor: jr » Sat Feb 23, 2008 10:30 pm

spudchucker do us a favor measure the distance! I thought you said it was for distance- then why are you shooting at signs?

Wouldn't that classify as destruction!
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Unread postAuthor: frankrede » Sat Feb 23, 2008 10:36 pm

spudchucker wrote:Ok what range in feet do you think this cannon could achieve?
depends on the ammo, temperature, wind, angle and how you measure.
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Unread postAuthor: Novacastrian » Sat Feb 23, 2008 10:49 pm

spudchucker wrote:Ok what range in feet do you think this cannon could achieve?


At an operating pressure of 60psi with your 6' barrel, a D cell as ammo i would predict *looks into Crystal ball* a distance of around 400', that is being generous.
Please don't think that i am trying to erk you mate, i just don't like when numbers get thrown around- i have a hard enough time trying to understand them as they are. :lol:

Edit- DYI, i like rain, i guess the only thing for spudchucker to do is test the distance achieved, with either a tape measure or a walker wheel.
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America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

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Unread postAuthor: Sticky_Tape » Sat Feb 23, 2008 10:55 pm

jr wrote:spudchucker do us a favor measure the distance! I thought you said it was for distance- then why are you shooting at signs?

Wouldn't that classify as destruction!

Well yes but that isn't why I made the cannon I just wanted to see what it would do.

Weird I tried downloading ggdt but it wouldn't work can sombody tell me how I tried 3 times and failed.
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Unread postAuthor: Novacastrian » Sat Feb 23, 2008 11:02 pm

I know when i tried to download GGDT only certain links worked, try having a look for a different link.
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America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

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