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Built a pneumatic 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: Counterstriker » Tue Mar 11, 2008 8:30 pm

Ohh Yah I know I need a longer barrel. I have another longer barrel but it didn't fit the ammo in it. It wasn't met to be too impressive :D Sice I am still working the kinks outa the gay union.
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Unread postAuthor: SpudBlaster15 » Tue Mar 11, 2008 8:37 pm

DYI wrote:Also, I'm not trying to lure you into the SCTBDC trap


So DYI, what ever happened to your original plan to build the SCTBDC as a handheld cannon? :D

You've ALMOST suckered me into building a huge, useless cannon several times with your "most powerful air cannon in Canada" comments, but I haven't yet fallen into the trap, as I still like my handheld launchers. :roll:
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Unread postAuthor: DYI » Wed Mar 12, 2008 10:25 am

So DYI, what ever happened to your original plan to build the SCTBDC as a handheld cannon?


Personally, I blame clide, for alerting me that I could use a longer barrel on the 1.0 version. Before that, I had always heard that 2:1 was the best C:B ratio for pneumatics, and had never really thought much about it. Then I started testing on GGDT, and realised that I could still be gaining performance at a 12' long barrel... and the handheld design went downhill from there.

The funny thing is, now I'm trying to downscale and increase portability and ease of use. However, since I'm so impressed with what my big guns can do, I want the same power, but in a handheld package. This gets rather difficult.
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Unread postAuthor: SpudFarm » Wed Mar 12, 2008 11:48 am

haha, i think you can do it if you make your hybrid handheld...
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Unread postAuthor: DYI » Wed Mar 12, 2008 6:05 pm

Don't worry spudfarm, the handheld launcher is on its way.

The near-complete hybrid project at the moment will only be capable of 10x, nowhere near high enough to make a handheld size worth it in my opinion.
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Unread postAuthor: OuchProgramme » Wed Mar 12, 2008 6:06 pm

Hmmm...the shot wasn't too impressive =/.
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Unread postAuthor: bigbob12345 » Wed Mar 12, 2008 6:14 pm

That wasnt amazing but it is what you would expect from 10psi.
100psi should yield much better results .
I think the barrel diameter is overkill for the chamber size but I guess it doesnt matter that much but atleast maker the brreo longer as DYI mentioned.
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Unread postAuthor: Counterstriker » Wed Mar 12, 2008 6:27 pm

bigbob12345 wrote:That wasnt amazing but it is what you would expect from 10psi.
100psi should yield much better results .
I think the barrel diameter is overkill for the chamber size but I guess it doesnt matter that much but atleast maker the brreo longer as DYI mentioned.


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Counterstriker wrote:Ohh Yah I know I need a longer barrel. I have another longer barrel but it didn't fit the ammo in it. It wasn't met to be too impressive :D Sice I am still working the kinks outa the gay union.
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Unread postAuthor: OuchProgramme » Wed Mar 12, 2008 6:32 pm

Why dont you add a reducing coupler to a smaller barrel-In diameter- for better results?
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Unread postAuthor: bigbob12345 » Wed Mar 12, 2008 6:34 pm

Counterstriker wrote:
bigbob12345 wrote:That wasnt amazing but it is what you would expect from 10psi.
100psi should yield much better results .
I think the barrel diameter is overkill for the chamber size but I guess it doesnt matter that much but atleast maker the brreo longer as DYI mentioned.


..Read...

Counterstriker wrote:Ohh Yah I know I need a longer barrel. I have another longer barrel but it didn't fit the ammo in it. It wasn't met to be too impressive :D Sice I am still working the kinks outa the gay union.


Sorry, Ive really been really stupid lately.
Maybe I need to take a break from this forum to recover
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Unread postAuthor: SpudBlaster15 » Wed Mar 12, 2008 11:28 pm

DYI wrote:The near-complete hybrid project at the moment will only be capable of 10x, nowhere near high enough to make a handheld size worth it in my opinion.


"Only" 10x mixes...

You underestimate the potential power that can be obtained from gases at temperatures of 4000F, and pressures of ~1000PSI.

Of course, that can be expected, as you have only dealt with <500PSI nitrogen at room temperature. Hot gases at double the pressure will make a massive difference.

You really should look into commercial firearms if you are only looking to get maximum power out of a handheld launcher. It is probably close to impossible to build something that fires spudgun sized ammo and meets or exceeds the muzzle energy of common hunting rifles, but is lightweight enough to be held in the average person's hands without causing bodily harm due to recoil forces.

EDIT: And I think I just figured out PCGUY's spudbux algorithm. I seem to have been substantially over complicating it.
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