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GB mortar burst disk

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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GB mortar burst disk

Unread postAuthor: Carlman » Wed Mar 19, 2008 7:29 am

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heres one for ya, basically a triggered burst disk but with the 'puncturer' getting hit by the projectile thus bursting disk and firing projectile.
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Unread postAuthor: bigbob12345 » Wed Mar 19, 2008 8:01 am

Good idea but it has been done before in a similar way.
Another problem I can see is the golf ball not having enough energy or weight to push the nail down hard enough.
you would need heavy, loose ammo so it can hit it with enough force.
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Unread postAuthor: psycix » Wed Mar 19, 2008 8:32 am

I think the GB can surely bang it hard enough but I can imagine that nail and piece of pvc flying out the barrel at high speed...

Its also all a bit flow restrictive isnt it?
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Unread postAuthor: Carlman » Wed Mar 19, 2008 8:38 am

the nail will not fly out because it will have a stopper on below the disk to stop it going out and the head of the nail wil stop it from falling into chamber.

the golf ball should hit it hard enough.

it wont be flow restrictive that much at all. the disk will be like the nuclear symbol. (Y) <---- no thats not an ass, its the nuclear symbol lol
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Unread postAuthor: STHORNE » Wed Mar 19, 2008 9:04 am

bigbob12345 wrote:Good idea but it has been done before in a similar way.
Another problem I can see is the golf ball not having enough energy or weight to push the nail down hard enough.
you would need heavy, loose ammo so it can hit it with enough force.


Depends on what size barrel you're using for the golf ball. if you are using a 1.5" barrel, then most likely the ball won't be loose enough to let air from the barrel pass by the ball when dropped to allow a faster, harder hit. But if you are using a 2" barrel, you should be fine because that gives the air space to quickly escape around the ball when you drop it (make the ball fall faster).
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Unread postAuthor: Carlman » Wed Mar 19, 2008 9:28 am

yea but a 2" barrel will also drop muzzle velocity of my chosen golf ball ammo, a small hole in the bottom of the barrel will work fine
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Unread postAuthor: psycix » Wed Mar 19, 2008 6:16 pm

Isnt the loss of air due to the 2"barrel about the same as the loss of air due to your hole in the bottom?
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Unread postAuthor: SpudFarm » Wed Mar 19, 2008 7:16 pm

no the hole in the barrel would not even be noticed... and he can hold a finger there..

(Y)(Y)(Y)(Y)(Y)(Y)(Y)(Y)(Y)(Y)(Y)
^thats the way aha aha i like it^
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Unread postAuthor: elitesniper » Wed Mar 19, 2008 7:21 pm

I think the flow will be terrible, because when you puncture it the whole disk will not burst, basically your just popping a hole in the burst material and air will come rushing out of that one hole. :wink:
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Unread postAuthor: SpudFarm » Wed Mar 19, 2008 7:24 pm

have you seen the QCTBDC?
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Unread postAuthor: bigbob12345 » Wed Mar 19, 2008 7:26 pm

Elitesniper is right
although an easy solution to the problem is to put mulitple nails
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Unread postAuthor: elitesniper » Wed Mar 19, 2008 7:27 pm

yep, but thats from the inside, and he is using a broad head and aluminum from a soda bottle, broad heads are not just one point like a nail, once it punctures its more of a tear that keeps getting bigger until its the disk is gone.
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Unread postAuthor: SpudFarm » Wed Mar 19, 2008 7:30 pm

i would say that is gonna work! load up a burst disk cannon to 100psi and push a nail through the disk then...
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Unread postAuthor: bigbob12345 » Wed Mar 19, 2008 7:31 pm

ill go test that right now and see what happens
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Unread postAuthor: elitesniper » Wed Mar 19, 2008 7:33 pm

Well, I have tested that with a screw driver and its just puntered the disk, but lets just patiently wait for bigbob's results :)
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