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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: POLAND_SPUD » Wed Dec 28, 2011 3:21 am

I think he meant 'hey jsr why don't you use an oring detent and a ball detent?'
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 28, 2011 5:37 am

There was some talk of the combination a couple of pages ago but nothing that wasn't horrendously complicated if I recally correctly.
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Unread postAuthor: killerbanjo » Tue Jan 31, 2012 9:13 pm

Been a month and a day, need an update! Also why dont you just use a burst disk?!

Also for pellets you could do this... (Push the skirts so there larger like many spuders do so they can use them in 6mm id barrels.

Edit: wooooops sorry for the picy size
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Unread postAuthor: jackssmirkingrevenge » Wed Feb 01, 2012 1:01 am

killerbanjo wrote:Been a month and a day, need an update!


Heh been occupied with other things ;)

Also why dont you just use a burst disk?!


At this point, it seems quite silly not to - but the advantages of a "valveless" cartridge mean it's worth some effort.

Also for pellets you could do this... (Push the skirts so there larger like many spuders do so they can use them in 6mm id barrels.


Tried that too, sadly the skirt is too soft to hold decent pressure.
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 12, 2012 8:13 am

A different take on the fill rig, instead of putting the cartridge inside an airtight chamber, the mouth is clamped against a schrader outlet.
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Unread postAuthor: Labtecpower » Sun Feb 12, 2012 8:24 am

This looks much easier than the previous one!

Do you use delrin for the plugs?
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 12, 2012 8:41 am

Labtecpower wrote:Do you use delrin for the plugs?


Yep, all put together with araldite. Also I cut the slot out of the tube using the mill and slitting saw, nice and neat :)
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Unread postAuthor: Gun Freak » Sun Feb 12, 2012 8:43 am

I like it :)
Yesterday I was mixing epoxy for a stirling engine and thought, damn, it's been a while since JSR made anything! :lol:
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 12, 2012 8:59 am

Gun Freak wrote:mixing epoxy for a stirling engine


I wouldn't normally recommend epoxy for applications that require constant high temperature.

damn, it's been a while since JSR made anything!


Been very busy with the day job and it's been mostly a cycle of work and sleep with very little in between.

I like it :)


One thing I don't like about it is that mix number is limited by the capacity of the cartridge. Pump dead volume is 1.75mL, which means that say the cartridge volume is 1mL, if I flood the cartridge with butane that's 1mL out of 2.57mL which is 36%, so the maximum mix I can get is 11. To solve this I could either try injecting fuel into the pump itself instead, or customising the pump to remove the dead volume.
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Unread postAuthor: POLAND_SPUD » Sun Feb 12, 2012 10:38 am

To solve this I could either try injecting fuel into the pump itself instead, or customising the pump to remove the dead volume.
or you can get a fridge compressor :D

A different take on the fill rig
I like it - simple yet it does its job
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 12, 2012 12:07 pm

... aaaand win!

[youtube]http://www.youtube.com/watch?v=tGp6BizXLgQ[/youtube]

Tried out with a 0.177" cartridge I had made a while ago but hadn't worked with my other fill rig, the above is at 6x.

I didn't need to use a rubber seal, the smooth face of the cartridge mated well with the delrin endcap:
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Unread postAuthor: POLAND_SPUD » Sun Feb 12, 2012 12:27 pm

hmmm now that you have a lathe and some delrin.... would you be so kind as to test if it's possible to build a lapped piston valve ? :D
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 12, 2012 6:13 pm

POLAND_SPUD wrote:would you be so kind as to test if it's possible to build a lapped piston valve ? :D


You mean metal-on-metal? Hmmm...
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Unread postAuthor: Lockednloaded » Sun Feb 12, 2012 6:16 pm

How's the power for that cartridge? What mix can it take?
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 12, 2012 6:28 pm

Lockednloaded wrote:How's the power for that cartridge? What mix can it take?


With the o-ring set as it is on this particular cartridge, beyond 90 psi or so it will eventually let the BB pop.

In any case, I'm not expecting power to be amazing. At 28x my 0.177" mini was about as powerful as an adult air rifle. For this reason I'll probably move up to 0.22".
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