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UPCL-495CI

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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Unread postAuthor: SpudBlaster15 » Sat May 05, 2007 2:23 pm

Potatoes leave 2" deep, fist sized dents in the sides of the same refrigerator, and easily remove large chunks of wood from trees. Other than that, I haven't really fired it at many items.
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Unread postAuthor: SpudBlaster15 » Mon May 07, 2007 10:35 pm

Video will be posted within an hour!
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Unread postAuthor: SpudBlaster15 » Tue May 08, 2007 12:33 am

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Unread postAuthor: jackssmirkingrevenge » Tue May 08, 2007 12:40 am

nice, though instead of stacking all those clays, why not set up a board and load a "shotgun" round in the same way this punt gun is demonstrated.
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Unread postAuthor: SpudBlaster15 » Tue May 08, 2007 11:51 pm

Holy crap! :shock: That is a marvelous idea. I am going to try that this weekend (if I can find enough in tact clays laying around).
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Unread postAuthor: cash68 » Wed May 09, 2007 12:19 am

Hotwired wrote:The multiple spark trend is just gibberish, the power comes from the mix not the lil electric sparks.


Sort of. More sparks= MAYBE more burned mix. More efficiently burned mix= less waste= more power.

This is why some engines use multi tipped spark plugs, or fancy multi spark ignition systems.
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Unread postAuthor: meatballs » Wed May 09, 2007 2:47 pm

and combustion moves outward from each spark. it you have two sparks spaced correctly in the chamber, you could theoretically have twice the burn speed, meaning more power. more sparks in a combustion is like a faster valve in a pneumatic.
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Unread postAuthor: SpudBlaster15 » Wed May 09, 2007 5:48 pm

The key word here being theoretically. In practice, multiple sparks makes no difference in the performance of this launcher.
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Unread postAuthor: SpudBlaster15 » Wed May 09, 2007 5:55 pm

Curse this lack of an edit button...

These tests show that increasing the quantity of fuel burned vs. potato position has no statistical effect on launcher performance, unless the C:B ratio is absurdly large (6:1).
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Unread postAuthor: Velocity » Sat May 12, 2007 10:13 pm

Very nice combustion Spudblaster. As I have said in some of your other finished cannon threads, I love the fact that you use longer barrels to maximize performance. That combustion looks crazy powerful. Good luck in the contest.

And BTW, I am pretty sure the BFIII was built for aesthetics and ergonomics, with power coming after those two in terms of importance...
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Unread postAuthor: Spedy » Fri Jun 22, 2007 4:41 pm

Awesome launcher. The breech loading (is that what its called?) system is cool too. The whole thing looks very well done. Btw, What type of connector is used to lock the barrel after loading? I've never seen that type of connector before.
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Unread postAuthor: captaincrash17 » Wed Dec 03, 2008 9:35 pm

Hey really nice cannon, I've been researching for my first advanced combustion and this has definitely given me some ideas. Also you say you are using electronic ignition but what kind? BBQ igniter, stun gun?
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Unread postAuthor: JDP12 » Thu Dec 04, 2008 9:05 am

Captaincrash- please don't kick up a topic over a year old to ask what kind of ignition.

In response, it is an electric BBQ ignitor.

Welcome to the forums
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Unread postAuthor: Radiation » Thu Dec 04, 2008 10:56 am

Man there's been a rash of kick ups lately. I'm actually super irritated about this one, I saw "Combustion Contestant" and got all excited thinking the new contest had kicked off. Now I'm just mad. :x
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Unread postAuthor: starman » Thu Dec 04, 2008 11:25 am

On a side note, it's funny SB found no advantage to multiple sparks in his chamber above. My experience has been quite the opposite and more than just theoritical...in fact very noticiable performance improvement with 3 gaps over 1 in the real world.
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