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Strange but good coaxial power results...

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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Strange but good coaxial power results...

Unread postAuthor: Spudinator » Fri Jun 14, 2013 1:46 am

So I've been playing with combustions lately quite a bit. My old favorite 650 CI over/under was still my favorite until I recently recovered my bolt action 5' golf ball barrel, from the spudtech days, at a friends house where it had sat hidden for years, and created a new over/under. When I found it I cut the barrel off an old coaxial I had, 2'x3" chamber with a 1.5" barrel 20" into the chamber and a 3"x1.5" straight tee at the front for a handle, which also served as the fueling port and ignition.

I slapped a 1.5" P trap (a 180° coupler more or less) between the two, and created a monster. Seriously. I've chronied it at a buddies place, with a reputable chrony, and averaged 830 fps with MDX golfballs+mapp gas between 4 shots. The fifth hit the chrony :shock: . No more chrony, but luckily (for me) it was my buddy that shot it lol.

I have never had a standard combustion shoot so hard, at least for its size. A 200-some CI combustion shouldn't have the sharp kick of a rifle in my experience. I almost wonder if the combination of the ignition placement and coaxial open chamber (open as in the entire chamber portion of barrel is used as a chamber) is having something to do with it. Some sort of flame front speed increase or something. Thoughts?

(I'll try to pics and vids up soon, its pretty impressive)[/i]
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Unread postAuthor: jackssmirkingrevenge » Fri Jun 14, 2013 2:27 am

Interesting... did you run it through HGDT?
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Unread postAuthor: Spudinator » Fri Jun 14, 2013 1:09 pm

No I haven't, my phone is my computer/internet source and it won't support HGDT. Perhaps if I got specs and a pic for reference someone here could run the numbers? I'm really curious about this, I've been spudding for 10 years and I've never seen this kind of power. It really does kick like a rifle, something like a .243 or around there. Kinda interesting watching my little brother shoot it, he's 13 and it kicks his ass every shot but he loves it.
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Unread postAuthor: Gleedaniel13 » Tue Aug 06, 2013 3:39 am

I think you should go on internet cafe so that you can test it with the personal computers. Then by that time you will really know the results.
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