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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 » Sun Sep 18, 2011 12:24 pm

POLAND_SPUD wrote:well yeah but that would consume my monthly income :(


Drink less :D

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for under 50 euros...seems like a reasonable price


... but don't expect finely finished quality for that price either, it would be the "soviet" tovarish-it-works! edition ;)

who said you can't build a pistol in 0.22" calibre?


That's along the lines I'm moving now :)
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Unread postAuthor: wyz2285 » Sun Sep 18, 2011 12:57 pm

is this going to be parte of a hybrid cartridge rifle for the master class challenge :?:
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 18, 2011 1:11 pm

I definitely want to make a cartridge multishot, if it's ready on time then it will be entered.
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Unread postAuthor: al-xg » Sun Sep 18, 2011 4:29 pm

Looks like you need some sort of stop for the Delrin ring, a slightly smaller OD "O" ring placed in a bored out section of the front ring, but not long enough to make contact with the Delrin until just over full mix pressure.

Mmm but that would then mean it wouldn't seal around the front ring... mmm
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 19, 2011 12:44 am

al-xg wrote:Looks like you need some sort of stop for the Delrin ring, a slightly smaller OD "O" ring placed in a bored out section of the front ring, but not long enough to make contact with the Delrin until just over full mix pressure.


One option is to eliminate the Delrin ring altogether, but the o-ring will still be compressed by the gas pressure. Still, might give this a go before boring it out for 0.22".

Mmm but that would then mean it wouldn't seal around the front ring... mmm


Tricky isn't it? But once I figure it out, the world will be my oyster :) having a more or less standardised self contained cartridge system will open up an unbelievable array of possibilities, look at what it did for firearms.

I also want to prototype something along these lines for the pneumatically inclined.
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 19, 2011 12:52 pm

[youtube]http://www.youtube.com/watch?v=1xYTioZ4BVc[/youtube]

Bored it out to 0.22" et voila. You can see the pellet moving across the screen after bouncing off the backstop.

Good:

- tiny (1mL approx) chamber pressurised to 20x

- lead projectile succesfully employed as "valve" sealing against o-ring without the need for a separate valve.

Bad:

- two poorly supported 1mm pins simply won't do :roll:

Hmmm...
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Unread postAuthor: Labtecpower » Mon Sep 19, 2011 1:02 pm

ummm... threaded steel?

I believe that at 28x mix you just flood the chamber with butane, and pressurize it?

Maybe it would be a nice idea to clamp your cartridges in a small vice, so you can observe it better on video.
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Unread postAuthor: wyz2285 » Mon Sep 19, 2011 1:12 pm

I tested my at 10x mix, everything worked perfectly :D
charged to 15x(only air), the valve still holds the bb, no leaks :P
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Attachments
IMG302.jpg
10x with the bb in place
IMG303.jpg
15x
CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 19, 2011 1:52 pm

Labtecpower wrote:ummm... threaded steel?


Maybe threaded Delrin would seal as per attached, maybe I'm being mindlessly optimistic again :)

I believe that at 28x mix you just flood the chamber with butane, and pressurize it?


You believe correctly.

Maybe it would be a nice idea to clamp your cartridges in a small vice, so you can observe it better on video.


Nothing really to observe here, the pints tore out of the cartridge body :roll:

I tested my at 10x mix, everything worked perfectly
charged to 15x(only air), the valve still holds the bb


Good on you :) remember you're messing with very high pressures now, be careful!
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Unread postAuthor: Labtecpower » Mon Sep 19, 2011 2:12 pm

here's my 5c...


Why not ditch the combustion compressed O-ring, and use a piece of threaded Delrin to compress it?

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(too lazy to use autocad)

When loading you loosen the ring, and after loading you compress it and fill it with mix.
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Unread postAuthor: POLAND_SPUD » Mon Sep 19, 2011 2:16 pm

hmm assuming the cartridges are to be fired from a chamber (like in a real gun)... you might consider machining them out of delrin only... lol i know it sounds dangerous
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 19, 2011 2:17 pm

Labtecpower wrote:Why not ditch the combustion compressed O-ring, and use a piece of threaded Delrin to compress it?


Similar to this, hmmm...

POLAND_SPUD wrote:hmm assuming the cartridges are to be fired from a chamber (like in a real gun)... you might consider machining them out of delrin only... lol i know it sounds dangerous


While it's the way of the future, I want flying brass dammit!

:D


Still, hmmm...

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Unread postAuthor: Labtecpower » Mon Sep 19, 2011 2:29 pm

Similar to this, hmmm...


But I see you had sealing problems..

In the drawing the edges are straight, but maybe you could get a better seal if you put a very light edge on it (pushing the O-ring inwards)

hmm assuming the cartridges are to be fired from a chamber (like in a real gun)... you might consider machining them out of delrin only... lol i know it sounds dangerous


Plastic stays plastic... I like thick metal cartridges :D
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Unread postAuthor: POLAND_SPUD » Mon Sep 19, 2011 2:35 pm

ohh I haven't seen that...

want flying brass dammit!

lol that reminds me of one occasion when I was going to suggest caseless (more like GP-25 granades than this) ammo on one occassion but then I realized you want flying brass dammit!
:D
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Last edited by POLAND_SPUD on Mon Sep 19, 2011 2:39 pm, edited 1 time in total.
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Unread postAuthor: Labtecpower » Mon Sep 19, 2011 2:37 pm

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