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hybrid cartridges

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 » Fri Oct 01, 2010 4:48 am

ilovefire wrote:are you using a O-ring or a rubber tube, because i made one with a bit of rubber tube and the bb popped at about 200 psi and i had a bit of fun with it and after maybe 10 shots the burst pressure was less the 150psi


I found some "K-Flex" clear polyurethane tube at work, pretty hardwearing stuff, I think the I/D is around 8mm. I also cast it with a 3/8" bearing already in place, so instead of uniform hold it will already have a recess to retain the bearing.

Absolutely no idea what pressure it will hold though, testing in about 5 hours.
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Unread postAuthor: ilovefire » Fri Oct 01, 2010 6:14 am

sounds good cant wait to see it, and to see how the seal lasts after multiple shots!
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 01, 2010 6:23 am

There certainly is a lot of heat generated, I took apart on of the cartridges I had only used at 6x and the foam disks that I use when casting which was exposed to the combustion had completely melted away :roll:

This is tough industrial grade stuff though, should hold up well. Only testing will tell, we'll see.
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Unread postAuthor: irisher » Fri Oct 01, 2010 7:46 am

Is it just the picture or are they pretty long? It seems as if a bolt action could be difficult if they are as long as they look.
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Unread postAuthor: Crna Legija » Fri Oct 01, 2010 9:54 am

there 14cm long, its in the description on the first page
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Unread postAuthor: MRR » Fri Oct 01, 2010 11:52 am

First of all great job on the cartridges :!: :salute:

And since you haven't build a proper launcher for it, my suggestion would be a double break barrel... that would totaly kick ass :twisted:
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Unread postAuthor: saefroch » Fri Oct 01, 2010 4:56 pm

Second the break-barrel design, though as Monbogg has shown it's no easy build.

Amazing cartridge setup, hybrid cartridges are getting to be a mini-revolution on Spudfiles, and maybe the entire spudding community. :lol:
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Unread postAuthor: al-xg » Fri Oct 01, 2010 6:19 pm

It seems as if a bolt action could be difficult if they are as long as they look.


The cartridge is slightly shorter than the 14.5x114mm ammunition used in single shot anti-tank rifles, semi auto anti-material rifles and heavy machine guns,, shouldn't be too much of a problem.

thanks, sadly no because there just aluminum they will get damaged to easily,


If that is the only limitation, using a casing catcher could be a solution.
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Unread postAuthor: ilovefire » Sat Oct 02, 2010 1:38 am

first of all yes the cartridges are quite long, also i dont really feel like making something that can have to much go wrong with it so its just going to be a simple bolt action, and as for difficulty im only going to have the bolt move at most 5cm just enough to get it to seal on the barrel and to lock it in place.

iv also been having problems with fueling even after doing all the calculations its still not working for me :evil:
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Unread postAuthor: ilovefire » Wed Oct 13, 2010 2:44 am

finished most of the workings of the gun and got a new battery for my ignitor so i have got it working, and quite consistently to so anyway here is a vid will have another up soon and hopefully some pics a bit latter

[youtube]http://www.youtube.com/watch?v=s3oQOFSXync[/youtube]

at the end i had a little spazz attack, that was from me accidentally tasering myself... not a good feeling

[youtube]http://www.youtube.com/watch?v=lNRdNJ_my6g[/youtube]
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Unread postAuthor: POLAND_SPUD » Wed Oct 13, 2010 4:46 am

wow the gun looks great
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Unread postAuthor: jackssmirkingrevenge » Wed Oct 13, 2010 4:54 am

sweet! really nice work, congratulations!

It's a real shame the bolt doesn't extract the cartridges, but that's a small detail, you made a multishot hybrid which works :D
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Unread postAuthor: Crna Legija » Wed Oct 13, 2010 5:08 am

very nice! look great you, you could add something to the cartridge to make it a bit easier to pull out. any idea on what kind of stock you going for?
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Unread postAuthor: ilovefire » Wed Oct 13, 2010 6:22 am

thaks, i am very pleased with it at the moment and i am thinking of changing my original idea on the stock to this if not just for the fact that it would look cool but it will also cut down on the length, but it also means i will probably have to get a scope for it though

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Unread postAuthor: SpudBlaster15 » Wed Oct 13, 2010 9:27 am

Nice work! I'm still not sold on cartridges being a viable option for full scale hybrid, but the fact that you have a working multi shot, pressurized air/fuel powered launcher is impressive.
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