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Bad power?

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Bad power?

Unread postAuthor: spudd » Fri Aug 10, 2007 5:05 am

I welded a spudgun about 30cm long with the barrel. i use a BBQ igniter wired with a sparkplug.
I sprayed som butane/propane refill and loaded with a little sharpened bolt with tape around it to make it air tight, then i shot at a apple and it only went about half way throug. earlyer i made a little blackpowder gun with the same barrel and i shot throu 3 apples no problemo.

Is it more power in blackpowder that gas? i really got a real bang with the powder, the neighburs wonderd whata hell was going on.
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Unread postAuthor: spanerman » Fri Aug 10, 2007 5:10 am

im guessing that the mix is bad....try propane metering..look it up in the wiki
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 10, 2007 5:14 am

Is it more power in blackpowder that gas?


Definitely - the performance you described is normal for a combustion of that size. If you want real power with this sort of laucher, you're going to have to think bigger.
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Unread postAuthor: spud yeti » Fri Aug 10, 2007 5:37 am

jackssmirkingrevenge wrote:
Is it more power in blackpowder that gas?


Definitely - the performance you described is normal for a combustion of that size. If you want real power with this sort of laucher, you're going to have to think bigger.


As you go bigger the gap will close between the two because the gas increases drastically in power whereas the blackpowder is unfeesable to increase in size at a certain point and will plateau.
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Unread postAuthor: Insomniac » Fri Aug 10, 2007 6:02 am

Black powder would give you more power, but the great thing about spudguns is that there isn't much residue, they can have simple electric ignition without one-time-use ignitors, and the fuel is EVERYWHERE. Go into anyones house and it will contain spudgun propellent...errm, I mean aerosol cans. :lol:
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Unread postAuthor: spud yeti » Fri Aug 10, 2007 6:14 am

Yay for axe deoderant :D
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Unread postAuthor: potatoflinger » Fri Aug 10, 2007 9:15 am

spud yeti wrote:Yay for axe deoderant :D

Why would you put that stuff in a cannon, it smells like fart spray :fart:
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Unread postAuthor: spud yeti » Fri Aug 10, 2007 9:21 am

potatoflinger wrote:
spud yeti wrote:Yay for axe deoderant :D

Why would you put that stuff in a cannon, it smells like fart spray :fart:


Haha, too true, but everyone still seems to own it :?
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Unread postAuthor: spudd » Fri Aug 10, 2007 10:34 am

thanks for the answers! Then i have to build a bigger combustion chamber but with the same small barrel and i will get those 3 apples
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Unread postAuthor: spud yeti » Fri Aug 10, 2007 10:39 am

Why not build it with a bigger chamber and barrel, to maximize efficiency, because your barrel is just as important as the chamber :wink:
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Unread postAuthor: spudd » Fri Aug 10, 2007 10:58 am

yeah, but i want to shot small hard projectiles and no potatoes
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Unread postAuthor: SpudBlaster15 » Fri Aug 10, 2007 11:27 am

If your ratio is already fairly decent, increasing the chamber size and leaving the barrel alone will not increase performance. Increasing the chamber size AND extending the barrel will, however.
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Unread postAuthor: spudd » Mon Aug 13, 2007 3:41 pm

hmm that sucks.. So i cant make a more powerfull cannon that can shoot small projectiles. I better get som more of that black powder
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Unread postAuthor: frankrede » Mon Aug 13, 2007 4:17 pm

You can, did you just not here what he said?
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Unread postAuthor: noob of noobs » Mon Aug 13, 2007 4:55 pm

I'm no moderator, but isn't talking about black powder banned on the forum? :roll: Plus, I'm not sure using it in PVC is a wise choice when it comes to fuel... Anyway, good luck. I also think to penetrate 3 apples you'll need a larger cannon with a larger barrel.
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