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2" Union Burst Disks

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: whoa044 » Tue Sep 28, 2010 7:31 pm

It's going to end up being a manometric high pressure gun. I'll need to find replacements for burst disks, because at the moment, I'll have to go through about 10 soda cans haha.

I might look into thick sheet metal, where only one piece is required.
Managing 20 soda can cutouts would be a real pain!
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Unread postAuthor: ramses » Tue Sep 28, 2010 8:59 pm

Somehow, I doubt you would need 10 can cutouts.

I assume the nipples are sch80 or higher?
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Unread postAuthor: whoa044 » Tue Sep 28, 2010 10:31 pm

You're right, more like 20 :P
It's all sch 80 forged steel (except for fueling, metering, etc)

In HGDT: With a 10x mix, 200psi burst disks give me 1000 fps for a lead projectile. The same mix and projectile, but with a 300psi burst disk, I get 1200fps.

The more burning I get to happen in the chamber before the disks rupture, the more energy is transferred to the projectile.

I'm looking into 14 gauge aluminum sheet metal as a burst disk.
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Last edited by whoa044 on Wed Sep 29, 2010 3:16 pm, edited 1 time in total.

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Unread postAuthor: MrCrowley » Wed Sep 29, 2010 12:45 am

In HGDT: With a 10x mix, 200psi burst disks give me 1000 fps for a lead projectile. The same mix and projectile, but with a 300psi burst disk, I get 1200fps.

Don't bother with 10x mixes unless the disk is bursting 600PSI+ in my opinion. Drop the mix, keep the burst pressure the same and the velocity is probably quite similar.
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Unread postAuthor: SpudBlaster15 » Wed Sep 29, 2010 12:55 am

MrCrowley wrote:Don't bother with 10x mixes unless the disk is bursting 600PSI+ in my opinion. Drop the mix, keep the burst pressure the same and the velocity is probably quite similar.


Agreed, high mixes require high valve opening pressures to properly utilize the additional energy.

For 10x, 600PSI is about the minimum I would use.
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Unread postAuthor: whoa044 » Wed Sep 29, 2010 12:28 pm

A 6x mix gave me 600 more fps, compared to an incomplete 10x burn.
I'll either use tin cooking pans, or 14 gauge sheet metal. Trying to get a burst pressure at 700-1000
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