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Mini(sorta) triggered burst disk cannon

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Mini(sorta) triggered burst disk cannon

Unread postAuthor: A-98 » Wed Jan 31, 2007 1:01 am

this weekend it was raining and i went to the hardware store to buy some supplies for a new cannon. i had never made a burst disk cannon, and wanted to try one out.

everything is currently 3/4". the chamber is 12" long and the barrel is 36" long. i use thick aluminum foil for the burst disks and pressurise the primary chamber to 80 psi, and the secondary to 20 psi.

i was originally going to have a 2" by 12" chamber, but my hardware store was out of the proper couplers

and here are the images
Image

Image

Image
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Last edited by A-98 on Mon Feb 05, 2007 10:13 pm, edited 1 time in total.
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Unread postAuthor: experament-u2 » Wed Jan 31, 2007 1:48 am

smart design iv never seen it before tho

great gun
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Unread postAuthor: A-98 » Wed Jan 31, 2007 12:58 pm

i was going to paint it but it has been raining :(
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Unread postAuthor: StealthSpud » Wed Jan 31, 2007 1:58 pm

Very nice looking gun and a unique design! Can't wait to see it with a paint job!
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Unread postAuthor: A-98 » Wed Jan 31, 2007 4:19 pm

have half days right now... just painted my other gun

post them up in a sec
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Unread postAuthor: Insomniac » Wed Jan 31, 2007 11:54 pm

You should use some hose or some fittings so the blowgun vents into the barrel. Someone (might have been killagorrila) said they made a sprinkler valve's blowgun vent into the barrel and it significantly improved performance.
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Unread postAuthor: A-98 » Wed Jan 31, 2007 11:58 pm

really?
hmm. might have to try that out this weekend.
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Unread postAuthor: Insomniac » Thu Feb 01, 2007 12:32 am

Oh and whats the C:B ratio on that?? Looks like the chambers too small.
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Unread postAuthor: medievalman » Thu Feb 01, 2007 8:17 am

looks nice, if i ever make a burst disc cannon, it would be like that one.

Insomniac wrote:Oh and whats the C:B ratio on that?? Looks like the chambers too small.


The c:b ratio is 0.333:1 the most EFFICIENT c:b ratio for a pneumatic is 0.2:1 but the most powerful is 1:1 or higher, so adding a larger chamber would increase performance, ALOT!
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Unread postAuthor: Hotwired » Thu Feb 01, 2007 9:23 am

medievalman wrote:The c:b ratio is 0.333:1 the most EFFICIENT c:b ratio for a pneumatic is 0.2:1 but the most powerful is 1:1 or higher, so adding a larger chamber would increase performance, ALOT!


I've been waiting for someone to bring this up since I posted my own C:B ratio on my pneumatic and then thought about it for a bit.

A ratio can't possibly be the same for all cannons. A cannon running on 60psi has to have a vastly different optimum ratio to one running at 200psi because of the difference in the stored energy.

With a 1:1 ratio in both cases the first would have 30psi behind the projectile as it left the barrel and the second would have 100psi behind it.
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Unread postAuthor: A-98 » Thu Feb 01, 2007 3:16 pm

ya, im aware that the CB ratio is really small. it was going to have a 2" chamber, but they were out of the proper couplers. :(
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Unread postAuthor: medievalman » Thu Feb 01, 2007 6:29 pm

before you paint it, you should get a 24" long 1" chamber. and why is it sch 80 pipe? sch 40 is plenty strong for pneumatics and combustions, just not hybrids
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Unread postAuthor: A-98 » Thu Feb 01, 2007 8:44 pm

its sch 80 because its threaded on both ends at my hardware store. and the unions are sch80...because they are....im going for a 2" by 12" so the same thing
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Unread postAuthor: Pneumatics » Thu Feb 01, 2007 9:58 pm

so, why is there 2 diffrent burst valves. is it so you can get higher pressures. Because i thought that maby between the burst valves the the 80 psi gets relief on the foil because the 20psi on the other side? is thais what it does?
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Unread postAuthor: MrCrowley » Thu Feb 01, 2007 10:33 pm

Its so he can trigger them instead of waiting and praying for it go boom once it hits the burst discs pressure.
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