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Last Blast Junior

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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Last Blast Junior

Unread postAuthor: mark.f » Sat Dec 09, 2006 7:47 pm

Last Blast Junior

Barrel: 48" x 1-1/4" SCH-40
Chamber: 15" x 3" SCH-40
Connection: breech-loading cam lock barrel
Mixing: Ozark Trails camping fan
Fuel: Thumb-operated MAPP meter
Ignition: single-gapped BBQ sparker handle

This is just a little gun I came up with this week to provide a more portable combustion cannon for me to use. Decided to build it after wanting another "small" gun. Here's a few pictures.

full.jpg

back.jpg

meter.jpg

fan.jpg
fan.jpg (27.88 KiB) Viewed 515 times

barrel.jpg
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Last edited by mark.f on Sun Oct 20, 2013 3:16 pm, edited 4 times in total.
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Unread postAuthor: falcone » Sat Dec 09, 2006 7:49 pm

very nice cannon, what so you shoot out of it mostly and about how far?

i like your sig btw
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Unread postAuthor: Bluetooth » Sat Dec 09, 2006 7:50 pm

Thats a cool cannon but to my standards i wouldn't clasify it as small. How far does it shoot?

EDIT: to late for the how far does it shoot :lol: . Any damage pics?
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Unread postAuthor: mark.f » Sat Dec 09, 2006 7:59 pm

All I've been shooting mostly are blanks and D-cells. It's dark so I can't tell the range/damage.
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Unread postAuthor: Bluetooth » Sat Dec 09, 2006 8:03 pm

You can't see where your shooting yet your shooting d-cells?
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Unread postAuthor: mark.f » Sat Dec 09, 2006 8:12 pm

Yup. I think you don't realize I live WAY the hell in the middle of nowhere. Mostly I've just been shooting into a stand of oak and underbrush right next to our house.
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Unread postAuthor: Bluetooth » Sat Dec 09, 2006 8:28 pm

How long does it take you to get to the closest store? ( i bet those pizza delivery guys hate you lol )
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Unread postAuthor: experament_u2 » Sat Dec 09, 2006 8:31 pm

nice gun i would defently want to see some damage pics :twisted:
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Unread postAuthor: SpudBlaster15 » Sat Dec 09, 2006 10:50 pm

Very nice looking gun. Are you going to wire the fan as to allow it to be turned on and off from outside the gun?
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Unread postAuthor: mark.f » Sat Dec 09, 2006 11:28 pm

Nope. It's just as easy for me to flip it on when I start and off when I'm done.
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Unread postAuthor: SpudBlaster15 » Sat Dec 09, 2006 11:41 pm

I suppose that would be the case, since you are using metered fuel. With spray propellants you have to have it off when fueling or the fan will blow it all out before you can get the cap on.
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Unread postAuthor: Flying_Salt » Sat Dec 09, 2006 11:46 pm

Very nice, but you should build a sparkstrip for it. My bbq ignitor can easily handle 3 good-sized sparks, and the preformance went WAY up. It went from boom to BOOM
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Last edited by Flying_Salt on Sat Dec 09, 2006 11:52 pm, edited 1 time in total.
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Unread postAuthor: SpudBlaster15 » Sat Dec 09, 2006 11:51 pm

Yeah, I would add an additional spark gap (or a strip for that matter). Adding another spark gap at the opposite end of my gun made the performance increase drastically.
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Unread postAuthor: mark.f » Sun Dec 10, 2006 12:08 am

I personally don't really bother with dual ignition anymore. I find that one gap at the back of the chamber works great for me. My first two serious cannons had dual ignition, and they're not anymore powerful than the LB and now the Junior. I still think that pressure rise is equal across the entire chamber, regardless of the position of the flame front(s).
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Unread postAuthor: Flying_Salt » Sun Dec 10, 2006 12:19 am

markfh11q wrote:All I've been shooting mostly are blanks and D-cells. It's dark so I can't tell the range/damage.


Wait, aren't blanks kind of dangerous? I thought the force of the explosion had to be transfered to the ammunition...
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