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2.5" burst discs?

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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2.5" burst discs?

Unread postAuthor: ALIHISGREAT » Thu Oct 23, 2008 8:02 am

ok so i want a tennis ball hybrid... but what could i use for a burst disc on 2.5" camlocks that would hold 100-150 psi?
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Unread postAuthor: hi » Thu Oct 23, 2008 8:56 am

might try the bottom of a soda can. or the side of a 2 liter bottle. anout 25 layers of aluminum foil.
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Unread postAuthor: harmon12407 » Sat Nov 01, 2008 10:20 pm

I laminate a sheet of aluminum foil and cut out circles. It works very well--just pressure test it to find out what kind of psi it can retain..

(This will vary depending on the thickness of both the foil and the lamination. 1 layer of foil + 1 side laminate is good to approximately 100 psi)
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Re: 2.5" burst discs?

Unread postAuthor: starman » Sun Nov 02, 2008 1:47 am

ALIHISGREAT wrote:ok so i want a tennis ball hybrid... but what could i use for a burst disc on 2.5" camlocks that would hold 100-150 psi?


You'll want to use a 3" camlock setup for an ideal tennis ball barrel setup.

I alternate 2" blue scotch masking tape strips, 7 layers on a 3" male offers about 80 psi...you should be able to go up to about 10 layers before it becomes unworkable and should get you up to or a little over 100 psi.

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Unread postAuthor: ALIHISGREAT » Sun Nov 02, 2008 3:27 am

is masking tap airtight? i wouldn't have thought so?!?!

and what do i laminate aluminium foil with?
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Unread postAuthor: SpudFarm » Sun Nov 02, 2008 4:29 pm

in my hybrid, i used 64layers over a opening with a diameter of 1.6" (i think) at 7x mixes, it works great. go from there, i had a good amount of delay for those shots so it was pretty darn near peak.
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Unread postAuthor: Fnord » Sun Nov 02, 2008 6:12 pm

Aluminum foil is obviously a decent choice if you want a reliable failure pressure, but thicker metal such as thin aluminum roofing trim will take a lot less work.

I'd try some really really thick poster board, which you can get from pretty much anywhere that has art supplies.

(Also, keep in mind you don't necessarily need 2.5" porting for a 2.5" barrel. 2" porting won't affect performance noticeably.)
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Unread postAuthor: starman » Sun Nov 02, 2008 7:34 pm

ALIHISGREAT wrote:is masking tap airtight? i wouldn't have thought so?!?!

and what do i laminate aluminium foil with?


Yep! Especially multiple layers.

_Fnord wrote:I'd try some really really thick poster board, which you can get from pretty much anywhere that has art supplies.


Thick cardboard beer coasters are also a good material to try.
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Unread postAuthor: WOW!! » Thu Nov 13, 2008 8:12 pm

This is the more expensive idea but photo paper works well, mind you the cost tho. But when I used it for 2-3x mixes it held up well.
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