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My Finished Mini

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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My Finished Mini

Unread postAuthor: mark.f » Fri Jul 14, 2006 5:14 pm

After some goading, I have been convinced to post my new mini here.

It is a simple design, (despite appearances), that performs very well. Despite all of boogieman's theories on how tee chambers were detrimental to mini designs, this one works great! I had to make a smaller meter attachment to get the right mix, but that only set me back 13 bucks.

The chamber is 550 mL, and the barrel is 3/4" SCH-40 PVC 5' long. The ignition is provided by two lengths of #6 allthread tapped, (yes, actually tapped, not just screwed), into the bottom of the tee where the tee overlaps the 2" SCH-40 pipe connecting it to the bottom endcap.

The back of the launcher is a SCH-40 NSF-pw pressure rated female cap screwed onto a male adapter.

As with all my launchers, I use male auto couplings, (quick connects), for my metered propane. The Schrader valve is used to vent the chamber, and of course to fuel the launcher to a 1.2x mix.

The reason I used all of these pressure rated fittings and safe construction methods is so I could take it up to a 1.2x/1.2x atm mix. That's about the highest I'm willing to go, though. Any higher than that and I'd be classified as "crazy".

Here's some pictures...

full.jpg
The full launcher...
full.jpg (39.87 KiB) Viewed 133 times


chamber.jpg
Chamber detail...


breech.jpg
Breech loading detail...


meter.jpg
The meter attachment...


schrader.jpg
Thank McMaster...
schrader.jpg (12.75 KiB) Viewed 133 times


chek.jpg
What a compression nut did to a Chek can...
chek.jpg (27.31 KiB) Viewed 133 times


And that's it! Feel free to comment.
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Last edited by mark.f on Sun Oct 20, 2013 2:28 pm, edited 3 times in total.
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Unread postAuthor: Atlantis » Fri Jul 14, 2006 5:20 pm

Very nice, very clean, you definetly know what you are doing. You didn't really need al PW fittings but I guess you can never be too safe.

Good Job!
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Unread postAuthor: mark.f » Fri Jul 14, 2006 5:41 pm

For any cannon of mine, (from now on at least), none other. :wink: They're actually cheaper at the feed store than the hardware store's DWV fittings. Heh heh...
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