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hybrid cartridge protoype without burst disk

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: jackssmirkingrevenge » Mon Aug 16, 2010 1:09 am

At the moment it's 4.4mm steel BBs and 4mm I/D silicone aquarium tubing.
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Unread postAuthor: JDP12 » Mon Aug 16, 2010 1:16 am

Ah cool. Thanks.

So is there a cartridge prototype curing in the JSR epoxy oven as we speak?? :violent2: (closes emoticon I could get to an oven :roll: )
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 16, 2010 1:25 am

There will be soon, still sipping my morning coffee and sorting through holiday photos for *cough* facebook *cough*

:oops: :oops: :oops:
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Unread postAuthor: JDP12 » Mon Aug 16, 2010 8:13 am

ahhh alright cool. Looking forward to it! How high of a mix do you expect that tight of a seal to withstand?
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 16, 2010 8:30 am

I've decided to go with a single seal, but curing with a BB already stuck in it. The problem with the first cartridge was that the outer diameter of the seal was identical to the inner diameter of the body, so there wasn't any room for expansion. Should be good for a 7-8x mix, we'll see.

edit: added some pics compared to a 7.62 NATO cartridge, note that I used Araldite, and also you can see the BB in the mouth of the cartridge.
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Unread postAuthor: POLAND_SPUD » Mon Aug 16, 2010 10:37 am

Should be good for a 7-8x mix
I am afraid that might not cut it... I'd say that there is a rule that detents are a lot stronger than expected oh well, you can always use 15-20X mix :wink:
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 16, 2010 11:40 am

Ah feck, I went and tested it early now the seal's popped out :?
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Unread postAuthor: SpudFarm » Mon Aug 16, 2010 12:20 pm

jackssmirkingrevenge wrote:Ah feck, I went and tested it early now the seal's popped out :?


That's too bad..
Did it pop out under fueling or the actual combustion pressure?
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 16, 2010 12:31 pm

Fuelling, it came out with the syringe nozzle.

I might just stop pissing around with this small size and make a 12 gauge shell sized round (similar to one of mypneumatic cartridge prototypes) chambered in 6mm.
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Unread postAuthor: JDP12 » Mon Aug 16, 2010 4:36 pm

I would be in favor of that. Power will leap incredibly, and then you can make one of these: Image
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Unread postAuthor: Gaderelguitarist » Mon Aug 16, 2010 6:03 pm

Forgive me if this is idiotic in any way, but isn't silicone notoriously difficult to adhere to?
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 17, 2010 1:40 am

Gaderelguitarist wrote:Forgive me if this is idiotic in any way, but isn't silicone notoriously difficult to adhere to?


You can chip off bits with a blade and improve its chances of sticking in the same way you would abrade a surface.

I was fully intending to make something but a rather lovely friend from the Motherland is here at the moment and we went out and got completely smashed :roll: let's see if I can cook something up before she recovers.

And yes, a replica of Chigurh's shotgun is definitely on the list ;)

edit: while it would be a plus, I've come to the conclusion that trying to use the projectile seal for filling is not practical. Using some simple parts I managed to make a small check valve that works very well, using some parts from a cigarette lighter valve. Making my n<sup>th</sup> prototype as we speak :)
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Unread postAuthor: SpudFarm » Tue Aug 17, 2010 5:31 am

That will work but ruins the simplicity somehow.

I made a diagram of what I have been thinking about.

The valve is made from a small rod that has a washer on the end (Perhaps you can epoxy it to the rod?) and a small rubber seal of some sort. The chamber electrode can probably be made from a piano wire section or something like that.

The seal can probably be made simpler by slipping a tight fitting rubber tube over the rod on the inside of the chamber, shouldn't need the washer.

I won't work more on it before I have your response to it :P It's kind of lacking detail right now.
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 17, 2010 5:47 am

Unfortunately, you do lose simplicity, but it's still simple enough to make 15-20 of them which is all I will need really.

As to your idea, quite close to the original concept ;)
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Unread postAuthor: SpudFarm » Tue Aug 17, 2010 6:06 am

As to your idea, quite close to the original concept :wink:


Yes but I think it is the best solution if you can get it to work. Since it was the original idea before you decided to try a projectile checkvalve that didn't work it deserves a try or five :)

The valve you are thinking about using now can probably be made easier and cheaper by using .22 cartriges with a hole drilled through the back. Just dent it at the "front" to stop the ball bearing from popping into the chamber during fueling.
You won't be asked why you buy so many lighters atleast :P

Well, good things usually comes from brain storms so I gave it a try.
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