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Cartridge help.

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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Cartridge help.

Unread postAuthor: warhead052 » Thu Oct 20, 2011 1:47 pm

I have been asked to make a hybrid howitzer for airsoft/paintball, (I know, but they wanted sound and shell ejection) and I would like some help with this. Considering they want a 2.5x mix at a minimum, would a real howitzer shell (unloaded of course) be able to handle the pressures? My overall question is, how should I go about making this? Burst disk hybrid, unbalanced piston (for shell ejection)?
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Unread postAuthor: jackssmirkingrevenge » Thu Oct 20, 2011 1:50 pm

bit more than you can chew?
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Unread postAuthor: warhead052 » Thu Oct 20, 2011 1:54 pm

Not entirely. I just want to make sure that I can get this done without anyone getting hurt from the resulting product. The captain of the team who wants me to build this is a friend who I have known for a while and has offered his machines if needed (lathe, mill, welding equipment, and a giant assortment of tools and around 7 air compressors...). So, any suggestions as to what I should do?
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Unread postAuthor: jackssmirkingrevenge » Thu Oct 20, 2011 1:59 pm

lathe, mill, welding equipment, and a giant assortment of tools


now you're talking :) what's the budget?
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Unread postAuthor: Labtecpower » Thu Oct 20, 2011 2:00 pm

Make a design? with equipment like that you should be able to make something nice :)

@jack; any money yet?
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Last edited by Labtecpower on Thu Oct 20, 2011 2:01 pm, edited 1 time in total.
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Unread postAuthor: warhead052 » Thu Oct 20, 2011 2:01 pm

I believe $800, plus what ever bits of scrap and other various parts at his house. (His land is covered in scrap metal from his grand father so we kind of have that part covered)

Edit, just saw your post Lab, I don't have any designs yet, except for a HGDT model of a burst disk at 5x with a disk failure at 100 psi.
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Unread postAuthor: Labtecpower » Thu Oct 20, 2011 2:07 pm

What calibre are you looking after?
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Unread postAuthor: warhead052 » Thu Oct 20, 2011 2:11 pm

2 inch bore, hopefully. Like I said, I would love to use an actual howitzer shell for the chamber to add realism, but if it can't handle the pressure then oh well. I will be shooting buckshot loads of 1,000+ airsoft bb's and 500+ paintballs. Maybe nerf vortex rockets at times, if they don't get shredded to pieces mid flight.
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Unread postAuthor: Labtecpower » Thu Oct 20, 2011 2:17 pm

Can you cut threads on the lathe?
If yes, you could make your own burst disk holders.

For an end cap I would go for machined and welded steel, with threads for filling valve and spark plug.
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Unread postAuthor: warhead052 » Thu Oct 20, 2011 2:20 pm

This will be my first time on a lathe, so I would probably make a few 5:10 scale models before I actually make the real thing. I will see about the threading.

Any suggestions on ignition?
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Unread postAuthor: Labtecpower » Thu Oct 20, 2011 2:25 pm

capacitor/ignition coil circuit works fine for me, but maybe you want something with a lower recharge time.

The system hotwired made would be very nice :)
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Unread postAuthor: Gun Freak » Thu Oct 20, 2011 3:55 pm

I'd give the plans to someone who knows what they're doing on the lathe and let then turn it, so you don't screw it up. Other than that, I don't have any good input. I'm a pneub :wink:
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Unread postAuthor: Zeus » Thu Oct 20, 2011 4:15 pm

Does it <i>need</i> to be a cartridge? It would be exceedingly cheaper to make a piston hybrid, SB15 and MrC will say the rate of fire is very agreeable.

If you have the chamber fixed, and have a camlock to the barrel which is free floating, then you'd be able to preload the ammo in PVC cartridges.

Much simpler, the rate of fire will be better, and you don't have to design something new. Not to mention it will be far more versatile.
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Unread postAuthor: evanmcorleytv » Thu Oct 20, 2011 4:27 pm

Hey warhead.. I wouldn't honestly expect a 14 year old to know how to build a hybrid, shell ejecting mortar.. but since we live 45 minutes apart, maybe I can help? FIRST OFF, you should make it pneumatic. and. only. pneumatic. I've been doing this for 4 years.. and I can honestly tell you that PNEUMATIC IS THE WAY TO GO!! Not to mention that fact that airsoft/paintball fields don't like combustible gasses.. if you need help call me up, and we can maybe even get together sometime!! I have a mauler that needs a cannon after all!!
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Unread postAuthor: Gun Freak » Thu Oct 20, 2011 5:47 pm

First off, age has nothing to do with it. Warhead has gained quite a bit of knowledge in his time here. I think he has the right knowledge to make it.
Second, about the pneumatic idea... I agree :D
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