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Dual ignition & chamber fan...do they help?

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: starman » Thu Nov 27, 2008 11:20 pm

Moonbogg wrote:Thats a good idea. What to do about ventillation then? Perhaps attach a small ball valve to the cleanout plug somehow?


Yeah a 4" NPT to 4" socket with a reducer bushing/nipple/PVC ball valve as shown below....works great!

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Unread postAuthor: Moonbogg » Sat Dec 06, 2008 9:08 pm

OK damn! I just built a new one with chamber fan and 3 spark gaps, havent fired anything through it yet, but dry fired it and the bang is way the hell more violent than before. It hurts my ears now where before it didnt. Can't wait to shoot something through it, its late and dark though and my neighbors are old and 911 happy.
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Unread postAuthor: starman » Sat Dec 06, 2008 10:17 pm

Moonbogg wrote:OK damn! I just built a new one with chamber fan and 3 spark gaps, havent fired anything through it yet, but dry fired it and the bang is way the hell more violent than before. It hurts my ears now where before it didnt. Can't wait to shoot something through it, its late and dark though and my neighbors are old and 911 happy.


Seeeeee! I wish more builders would try these things for themselves instead of just poo-poo it.
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Unread postAuthor: Moonbogg » Sat Dec 06, 2008 11:20 pm

I have a big 2" ball valve like the one you pictured above. I use a high performance 80mm PC fan, its totally insane lol. The "Vantec Tornado" is what its called and it exhausts the chamber in like 3 seconds. I'll get my camera from my wife and put some pics up. I also made a screw on section at the back of the chamber which is where the ball valve attaches. I wanted to be able to access the fan incase it fails so i could replace it.
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Unread postAuthor: Moonbogg » Mon Dec 08, 2008 10:00 pm

Went out shooting and I am totally impressed by the power of this freakin thing. lemons just go so far its absurd lol.
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Unread postAuthor: starman » Tue Dec 09, 2008 12:38 am

Moonbogg wrote:Went out shooting and I am totally impressed by the power of this freakin thing. lemons just go so far its absurd lol.


Build yourself a good golfball barrel...5 - 6 ft or so and a little burst disk setup. Shoot yourself a few golfballs. While very impressive, it's actually a little scary... :shock: Feels a little more military like than your average spudder spitting stuff out a few hundred feet.
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Unread postAuthor: Moonbogg » Tue Dec 09, 2008 2:42 am

starman wrote:
Moonbogg wrote:Went out shooting and I am totally impressed by the power of this freakin thing. lemons just go so far its absurd lol.


Build yourself a good golfball barrel...5 - 6 ft or so and a little burst disk setup. Shoot yourself a few golfballs. While very impressive, it's actually a little scary... :shock: Feels a little more military like than your average spudder spitting stuff out a few hundred feet.



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Unread postAuthor: starman » Tue Dec 09, 2008 3:06 am

Moonbogg wrote:I have a big 2" ball valve like the one you pictured above.


That's actually only a 1" PVC ball valve and is really all you need for ventilation. A 2" will certainly work, it's just big and burly and hard to open and close.
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Unread postAuthor: Radiation » Tue Dec 09, 2008 3:28 pm

Starman, how quickly does your chamber vent? 1" seems small, but with a powerful enough fan it probably does the trick just fine.
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