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Largest cannon you ever built

A place to ask general spud cannon related questions.
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Largest cannon you ever built

Unread postAuthor: benstern » Fri Jun 09, 2006 5:05 pm

What is the largest spudgun you have ever built?

What was the size and length of the barrel?
What was the size length of the chamber?
How much did it weigh?
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Unread postAuthor: Benny » Fri Jun 09, 2006 5:09 pm

i had a pneumatic, it had a 4 inch and 60 inch long chamber, it had a piston valve, and a 70 inch long 3 inch barrel.
im guessing that it weighs ~5o pounds.
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Last edited by Benny on Fri Jun 09, 2006 5:17 pm, edited 1 time in total.
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Unread postAuthor: cannon freak » Fri Jun 09, 2006 5:12 pm

Well Im in the prosses of building a large two chambered gun each 4in by 72in, and with a burst disk that melts and breakes for a valve. Also with detachible chambers for different sizes.
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Unread postAuthor: benstern » Fri Jun 09, 2006 5:30 pm

The reason I ask is that I am starting gathering materials to build my gigantic Pneumatic called the DOBA launcher. (Dead On Balls Accurate)
Here the specs:

3- 4" SCH-80 chambers each 5 feet long (60" and ~60 pounds)
2.5" Burst Disk
20 foot long 2.5" SCH-80 barrel (30 pounds)
300 PSI Hydrogen gas propellent
Custom muzzle break
Active recoil dampering
Barrel supports
Wheeled base

Ammo:
billiard ball (156.25 grams 2.25" diameter)
1 KG ball (1 kg 2.25" diameter)

In the future I might even make a tilt system!

Contact me on AIM if you want the GGDT and RangeCalc file for the cannon.
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Unread postAuthor: cannon freak » Fri Jun 09, 2006 5:57 pm

OMG man thats going to be one exspensive gun. Do you plan on making your own hydrogen gas, cause if not thats going to cost quite a bit.
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Unread postAuthor: x.X.Cpt.Rollhart.X.x » Fri Jun 09, 2006 6:46 pm

thats a big gun :

<a href="http://img518.imageshack.us/my.php?image=spudgun142ox.jpg" target="_blank"><img src="http://img518.imageshack.us/img518/6704/spudgun142ox.th.jpg" border="0" alt="Free Image Hosting at http://www.ImageShack.us"></a>
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Unread postAuthor: benstern » Fri Jun 09, 2006 7:04 pm

Yeah it is!

But size it not it's main attribute, speed along with range is.

For example
With a billard ball muzzle velocity will be 1686 ft/s (feet per second)!!

With a 1 KG ball muzzle velocity will be 720 ft/s but will have a maximum range of 5008.
If I simply increased barrel length to 300" the range will be 5357 feet.
if i doubled the barrel length to 40 feet, the range would be 5791 feet.

With an extremely lightweight projectile such as an aerogel muzzle velocity would would actually exceed the hypersonic barrier!!! (mach 5+)

Also, it will most likely be going to the next IPLA meet we have in vegas!
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Unread postAuthor: frogy » Fri Jun 09, 2006 7:57 pm

Um you don't need anywhere near that much fps w\ a billard ball to break the sound barrier....

We shot a potato 1200 fps and it broke the sound barrier in Ohio, when it was like 80 F. out and %23 humidity or something
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Unread postAuthor: schmanman » Fri Jun 09, 2006 8:01 pm

here's mine . 18 foot, 4 inch diameter barrel,10 feet of 6 inch diameter sch 40 as the air chamber. It weighs 100-150 pounds. here's the link :arrow:

http://www.spudfiles.com/forums/viewtopic.php?t=1747&

heres the link to the valve I designed for it :arrow:

http://www.spudfiles.com/forums/viewtopic.php?t=1666&



EDIT: at 45 psi, I have gotten 36 seconds of hangtime !!! with that big of chamber,5 psi adds 3-7 seconds of hangtime. Imagine the hangtime with 100 psi !!!! It cost $300-$350 to build .
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Last edited by schmanman on Fri Jun 09, 2006 8:28 pm, edited 7 times in total.
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Unread postAuthor: Shrimphead » Fri Jun 09, 2006 8:01 pm

Is it just me, or is 300 psi too much for a 3 or 4" chamber? My 3" is only rated to 260 psi. Sounds cool, though!
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Unread postAuthor: drac » Fri Jun 09, 2006 8:12 pm

It's SCH 80, it can handle significantly more pressure


My biggest gun is actually, pretty wimpy, but I live in the city.
It's got a 28 inch by 4 inch chamber, and a 1.5 by 36 inch barrel.


I do have a hybrid and a burst disk cannon in the works tho... expect them to be quite large. ;)
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Unread postAuthor: Shrimphead » Fri Jun 09, 2006 8:13 pm

Sorry, I'm blind. Didn't see that.
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Unread postAuthor: benstern » Fri Jun 09, 2006 8:47 pm

That was an impressive cannon! Though it was kinda funny how you mounted it on a table.
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Unread postAuthor: WOW!! » Fri Jun 09, 2006 9:55 pm

WHat kind of valve you useing on it? and my biggest is a twin 5' 4'' chambers and a 48" barrel.
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Unread postAuthor: )DEMON( » Sat Jun 10, 2006 2:24 am

What is this IPLA meet? And cool avitar benstern.
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