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| spudd |
 Posted: 08/10/2007 5:05 AM Post subject: Bad power? |
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Private
Joined: 10 Aug 2007
Posts: 8
22.93 Spud Bux
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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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| spanerman |
| Posted: 08/10/2007 5:10 AM Post subject: |
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Lieutenant Colonel
Joined: 17 Sep 2006
Posts: 447
296.08 Spud Bux
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| im guessing that the mix is bad....try propane metering..look it up in the wiki |
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| jackssmirkingrevenge |
| Posted: 08/10/2007 5:14 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6136
9089.40 Spud Bux
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| Quote: | | 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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| spud yeti |
| Posted: 08/10/2007 5:37 AM Post subject: |
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Brigadier General
Joined: 08 May 2007
Posts: 1040
1203.06 Spud Bux
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| jackssmirkingrevenge wrote: | | Quote: | | 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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| Insomniac |
| Posted: 08/10/2007 6:02 AM Post subject: |
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Colonel
Joined: 18 Dec 2006
Posts: 645
101.90 Spud Bux
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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.  |
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| spud yeti |
| Posted: 08/10/2007 6:14 AM Post subject: |
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Brigadier General
Joined: 08 May 2007
Posts: 1040
1203.06 Spud Bux
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Yay for axe deoderant  |
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| potatoflinger |
| Posted: 08/10/2007 9:15 AM Post subject: |
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Brigadier General
Joined: 02 Nov 2006
Posts: 857
1298.65 Spud Bux
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| spud yeti wrote: | | Yay for axe deoderant |
Why would you put that stuff in a cannon, it smells like fart spray  |
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| spud yeti |
| Posted: 08/10/2007 9:21 AM Post subject: |
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Brigadier General
Joined: 08 May 2007
Posts: 1040
1203.06 Spud Bux
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| potatoflinger wrote: | | spud yeti wrote: | | Yay for axe deoderant |
Why would you put that stuff in a cannon, it smells like fart spray |
Haha, too true, but everyone still seems to own it  |
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| spudd |
| Posted: 08/10/2007 10:34 AM Post subject: |
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Private
Joined: 10 Aug 2007
Posts: 8
22.93 Spud Bux
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| 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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| spud yeti |
| Posted: 08/10/2007 10:39 AM Post subject: |
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Brigadier General
Joined: 08 May 2007
Posts: 1040
1203.06 Spud Bux
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Why not build it with a bigger chamber and barrel, to maximize efficiency, because your barrel is just as important as the chamber  |
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| spudd |
| Posted: 08/10/2007 10:58 AM Post subject: |
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Private
Joined: 10 Aug 2007
Posts: 8
22.93 Spud Bux
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| yeah, but i want to shot small hard projectiles and no potatoes |
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| SpudBlaster15 |
| Posted: 08/10/2007 11:27 AM Post subject: |
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Major General
Joined: 18 Oct 2006
Posts: 1533
539.36 Spud Bux
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| 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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| spudd |
| Posted: 08/13/2007 15:41 PM Post subject: |
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Private
Joined: 10 Aug 2007
Posts: 8
22.93 Spud Bux
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| 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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| frankrede |
| Posted: 08/13/2007 16:17 PM Post subject: |
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Sangheili
Joined: 20 Jul 2006
Posts: 2628
111.57 Spud Bux
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| You can, did you just not here what he said? |
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| noob of noobs |
| Posted: 08/13/2007 16:55 PM Post subject: |
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1st Lieutenant
Joined: 12 Jun 2007
Posts: 264
438.07 Spud Bux
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I'm no moderator, but isn't talking about black powder banned on the forum?  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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