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KAP-R2

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: spit_spud » Tue Jan 09, 2007 6:06 am

it just make me ghost busters.... maybe you can use it in halloween to scare those kids like you and grab thier candies hahaha :D :D :D :D
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Unread postAuthor: abcdefg » Wed Jan 31, 2007 6:25 pm

FIll it wiht Butane and get a lighter
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Unread postAuthor: MrCrowley » Thu Feb 01, 2007 5:31 am

Its a pneumatic, you.....$!^#&!*!#
:wink:
Anywho, abcdefg, you seriously get on everyones nerves here, I wouldn't trust you with a peanut butter jar, some matches and a pen.

Next time before you post....think....do I need to post this, can I search for what im posting about, will it go down well with other members,its it sensible or relevant.
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Unread postAuthor: maz oner » Thu Feb 01, 2007 7:09 am

i dont know him but i think he was talking about for making fire balls but i dont know im just flicking through posts and im pretty new to this forum
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Unread postAuthor: MrCrowley » Thu Feb 01, 2007 3:34 pm

MrCrowley wrote:Its a pneumatic, you.....$!^#&!*!#
:wink:
Anywho, abcdefg, you seriously get on everyones nerves here, I wouldn't trust you with a peanut butter jar, some matches and a pen.

Next time before you post....think....do I need to post this, can I search for what im posting about, will it go down well with other members,its it sensible or relevant.



Edit:Maz instead of going off topic more and posting again ill just reply in my edit :P Yeah, I thought he was meaning something like that hence the ' :wink: '.
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Unread postAuthor: mega_swordman » Fri Mar 02, 2007 5:18 am

I concur. However fun it may be to create large fireballs, it's still pneumatic. I really like this gun since it is so unique, though I'm not sure why you need two valves for one tank (or maybe I'm looking at it wrong).
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Unread postAuthor: zeigs spud » Fri Mar 02, 2007 4:40 pm

i love that it is freakin awsome looking!!

only it seems a waste..you get one shot then gota a-take it off tol refill chamber or b- have someone els fill it up for you.

looks great!, just not very prafctical.
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Unread postAuthor: iknowmy3tables » Fri Mar 02, 2007 4:47 pm

mega_swordman wrote:I concur. However fun it may be to create large fireballs, it's still pneumatic. I really like this gun since it is so unique, though I'm not sure why you need two valves for one tank (or maybe I'm looking at it wrong).

people do it all the time with sprinkler valves, and pistons valves, two valves are better than one
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Unread postAuthor: cb4289 » Wed May 16, 2007 7:31 am

i dont now those hoses add a certen look too it
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Unread postAuthor: jjjd » Sat Mar 22, 2008 6:36 pm

Would it not make it more efficient to have the valve in the front? You should be loosing quite alot of pressure from the flow through the hoses. Just a thought.
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Unread postAuthor: STHORNE » Sat Mar 22, 2008 7:13 pm

jjjd wrote:Would it not make it more efficient to have the valve in the front? You should be loosing quite alot of pressure from the flow through the hoses. Just a thought.


You know, PCGUY did post this topic, so if you are talking to the maker of the cannon, I'm afraid to inform you that he won't reply
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Unread postAuthor: jjjd » Sat Mar 22, 2008 7:27 pm

I did not know that,I appologize.But the concept still remains, I am somewhat asking if I was right.
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Unread postAuthor: SpudFarm » Sat Mar 22, 2008 7:30 pm

you are right dead space = bad
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Unread postAuthor: Ragnarok » Sat Mar 22, 2008 8:15 pm

spudfarm wrote:you are right dead space = bad

That's an over generalisation.

Too much dead space is bad, however, in small amounts it can actually improve a launcher's efficiency and power, by providing a store of air that can provide higher flow than the main valve.
The optimum is quite dependent on the round, pressure and the dimensions of the cannon, but usually the results of optimising this are only a couple of percent added to the muzzle energy.
But a little is better than none, so people shouldn't fret over a cubic inch or two.

However, on this scale, it's going to do more harm than good.
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Unread postAuthor: bigbob12345 » Sat Mar 22, 2008 8:24 pm

spudfarm wrote:you are right dead space = bad


Well GGDT says completely contrary to that.
i have supposedly increased the velocity of the PG by 75fps by adding 5ci of dead space.
It doesnt mean GGDT is right but I believe it.

And a useless tid bit of info(to most people)
Dead space is requred to reach the speed of sound using air. It allows the air to heat up(projectile has to be tight with low friction also
the heated air now has a much higher possibilty of reaching every spudders goal.
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