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Sam's Hybrid Plans H.V.S-1

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: SpudBlaster15 » Thu Jul 12, 2007 4:31 pm

Be sure to post pictures in the Showcase when you are done.
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Unread postAuthor: spanerman » Thu Jul 12, 2007 4:33 pm

was the 15-20 psi number for each atm of air?? or for the 5x ?
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Unread postAuthor: SpudBlaster15 » Thu Jul 12, 2007 4:40 pm

That estimation was for 4x. Once you get it built, measure the chamber and meter volumes with water, and I will give you an exact number for each mixture you will be using.
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Unread postAuthor: DYI » Thu Jul 12, 2007 4:42 pm

I know that the pipe is steel, but I had always thought that the fittings were malleable iron (the names malleable or cast IRON are misleading, as they both contain a percentage of carbon. Malleable iron contains significantly less carbon than steel, and cast iron contains quite a bit MORE carbon than steel does).
If the fittings are actually steel, this means that I could theoretically take my triggered burst disk gun to 300psi with CO2. I wonder how loud that would be :twisted:
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Unread postAuthor: spanerman » Thu Jul 12, 2007 4:43 pm

sweet, thanks alot!
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Unread postAuthor: SpudBlaster15 » Thu Jul 12, 2007 4:46 pm

If the fittings are actually steel, this means that I could theoretically take my triggered burst disk gun to 300psi with CO2.


Noname has taken his Hardware store fittings constructed gun to 350psi with a bike pump in order to burst 2 layers of pop can disks. It worked fine.
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Unread postAuthor: Modderxtrordanare » Thu Jul 12, 2007 8:55 pm

SpudBlaster15 wrote:Frank, the proper propane quantity per atmosphere of air is 4.2%, not 4.7%. For a 4x hybrid, you should inject 16.8% of it's volume in propane.


Isn't 4.03% more accurate?
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Unread postAuthor: SpudBlaster15 » Thu Jul 12, 2007 9:40 pm

I don't think so. Burntlatke and GasEq both show stoichiometry as 4.2%.

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Unread postAuthor: spanerman » Wed Jul 18, 2007 9:31 am

BUILD PICS!!!!!!!!!!!!

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the spark plug is threaded in then sealed with metal epoxy...which is tough crap...i dont think i could get it out iff i wanted to....
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Unread postAuthor: spudthug » Wed Jul 18, 2007 9:46 am

i thought you were using a 6 inch nipple?
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: spanerman » Wed Jul 18, 2007 9:50 am

had dificulty finding one so i am useing 2/3 barrel nipples joined by couplers.
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Unread postAuthor: spanerman » Wed Jul 18, 2007 2:03 pm

just modded an old pyro controler toalow me to remote fire!

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Unread postAuthor: spudthug » Wed Jul 18, 2007 2:12 pm

when u join them with a couple the coupler is going to add another 2 inches..so you are going to have an 8 inch chamber...
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4" piston valved cannon-half done..( i spilt my cement...)

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Unread postAuthor: spanerman » Wed Jul 18, 2007 2:15 pm

well, the nipples are theaded almost all of the way into the coupler so theres only a .75 gap.....so the overall chamber size it more like 7, plus the recucing the sockets....its gunna be pretty big.....but pretty powerfull aswel...


what you guys think of my progress so far..
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Unread postAuthor: Gepard » Wed Jul 18, 2007 7:46 pm

Are the threads air tight? Or do you have to use PTFE tape?

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