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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: Gun Freak » Mon Feb 28, 2011 7:11 pm

Very nice... thats an epic win right there. Cheers :occasion5:
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 01, 2011 1:42 am

The best part is the "it didn't blow up" bit. Question is, to what mix will JSR dare take it? The seal is good to a 12x mix at least.... hmmm...

Also, will he actually make a complete launcher this time :shock:
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Unread postAuthor: ilovefire » Tue Mar 01, 2011 2:03 am

i think if your going to make a luncher at least use aluminium
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why make it if it dosent shoot?
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 01, 2011 2:30 am

Fair point.

These improvised submachineguns from Northern Irelandfor example have a certain earthy charm, I'll look around for some rectangular section scrap...
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Last edited by jackssmirkingrevenge on Tue Mar 01, 2011 4:05 pm, edited 1 time in total.
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Unread postAuthor: ilovefire » Tue Mar 01, 2011 2:35 am

are yes, you should make the top one just put the mag underneath :o
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why make it if it dosent shoot?
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 01, 2011 4:00 pm

Some progress, the filler rig and small "valveless" cartidge should be ready for testing tomorrow, as well as the breech and barrel setup for the PVC hybrid cartridge. I decided to try my hand at some metalwork, flattened out copper pipe FTW :D
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Unread postAuthor: Gun Freak » Tue Mar 01, 2011 6:47 pm

jackssmirkingrevenge wrote:Also, will he actually make a complete launcher this time :shock:

Not a chance :D
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Unread postAuthor: ilovefire » Tue Mar 01, 2011 7:40 pm

Gun Freak wrote:
jackssmirkingrevenge wrote:Also, will he actually make a complete launcher this time :shock:

Not a chance :D


i know the odds are stacked against him but i really do think he will pull it of, wont you JSR? :lol:
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Unread postAuthor: mark.f » Tue Mar 01, 2011 10:45 pm

This is the problem with jack's threads: they go on for pages and pages with nothing but tl;dr and paint diagrams, and then I finally pop in at around page 47 to find him actually building something.

Good job on getting the cartridges to work, jack. I can remember back in the SGTC days watching a short WMV of your combustion cartridge prototype. Glad to see the concept working smoothly.
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 01, 2011 11:29 pm

ilovefire wrote:I know the odds are stacked against him but i really do think he will pull it of, wont you JSR? :lol:


I actually think so,this launcher was oddly epiphanic.

This is the problem with jack's threads: they go on for pages and pages with nothing but tl;dr and paint diagrams, and then I finally pop in at around page 47 to find him actually building something.


investigación y desarrollo ;)

Good job on getting the cartridges to work, jack. I can remember back in the SGTC days watching a short WMV of your combustion cartridge prototype. Glad to see the concept working smoothly.


Cheers, things have certainly come a long way since then :)
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Unread postAuthor: jackssmirkingrevenge » Fri Mar 04, 2011 2:07 am

Update on these two prototypes:

- PVC cartridge breech: proceeding slowly but surely, this evening I should be able to test it for power and cartridge ejection with a makeshift bolt.

- Fill rig with a 6mm brass cartridge: I tried out the cartridge illustrated below, with mixed results. In terms of getting a hybrid mix sealed in the cartridge it worked brilliantly, however the seal will only reliably hold a BB for a 5x mix, and igniting this is not enough to pop it out. In any case, the short (2.5mm) external distance between the electrode and cartridge body means that for higher mixes the spark will arc externally anyway.
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cartridge for 4.5mm BB approximately to scale
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Unread postAuthor: JDP12 » Sat Mar 05, 2011 5:07 pm

how high of a mix do you plan to take the PVC cartridges? I may have to try this over break..

may just pick up some aluminum tubing as well.
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Unread postAuthor: jackssmirkingrevenge » Sat Mar 05, 2011 10:57 pm

JDP12 wrote:how high of a mix do you plan to take the PVC cartridges? I may have to try this over break.


Not more than 8-9x, I don't want to push it too far.

Here's progress so far:
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Unread postAuthor: JDP12 » Sat Mar 05, 2011 11:54 pm

lookin good! Forgive my stupidity.. what diameter projectiles are you firing out of the PVC ones?
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Unread postAuthor: jackssmirkingrevenge » Sun Mar 06, 2011 12:00 am

JDP12 wrote:what diameter projectiles are you firing out of the PVC ones?


3/8" ball bearings :)
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