combustion marble gun....
Yes
It depends on the setup, C:B ratio, fuel, fuel / air mix, etc.
It depends on the setup, C:B ratio, fuel, fuel / air mix, etc.
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jackssmirkingrevenge
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If you can make something like this with a barrel suitable for marbles you'll be fine, as to range it depends on the variables hubb017 mentioned, but the bigger you make it the better.
hectmarr wrote:You have to make many weapons, because this field is long and short life
Some have said that to make an efficient combustion, one would need a ratio of around .8:1. Also, is there a computer fan that small? I've never seen one and was just wondering.
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TurboSuper
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Yeah, a standard fan is 80mm, and they go much smaller.
Anywho, i'd reccomend a .8:1 for a propane-powered one.
Anywho, i'd reccomend a .8:1 for a propane-powered one.
"If at first you dont succeed, then skydiving is not for you" - Darwin Awards
I don't feel like doing math right now, but the RatCalc should be able to help you. Also, the rest of Burnt Latke's site may be able to answer any othe questions you may have. If not, we can.
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jimmy101
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Chamber volume = Pi(r<sup>2</sup>)L = (3.14)(7/2)<sup>2</sup>(45) =1730 cm<sup>3</sup>nightshot wrote:Specs:
Combustion Chamber = 7cm x 45cm
Barrel = 3cm x 90cm
C:B Ratio = 1:2
Propane powered
With a Computer Fan on chamber ...
If this specs are not good please tell me ;D
Barrel volume = Pi(r<sup>2</sup>)L = (3.14)(3/2)<sup>2</sup>(90) = 635 cm<sup>3</sup>
C:B ratio = 1730/635 = 2.72
The chamber is way too big for the barrel.
Perhaps drop the chamber to 25cm and increase the barrel to 150cm.
Chamber volume = (3.14)(7/2)<sup>2</sup>(25) =961 cm<sup>3</sup>
Barrel volume = Pi(r<sup>2</sup>)L = (3.14)(3/2)<sup>2</sup>(150) = 1060 cm<sup>3</sup>
C:B ratio = 961/1060 = 0.9
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TwitchTheAussie
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Cough nerd cough 
. Yeah mate the ratcalc can help you heaps trust me. But if ya wanna do things the easy way, try the water method. Block one end of the pipe to be your barrel, fill your chamber with water and tip it into the barrel. Minor equations can be used to get you .8:1 ratio
. Yeah mate the ratcalc can help you heaps trust me. But if ya wanna do things the easy way, try the water method. Block one end of the pipe to be your barrel, fill your chamber with water and tip it into the barrel. Minor equations can be used to get you .8:1 ratioRaise your horns if you love metal.
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Pyro Ninja
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I believe "experiment_u2" made a nice combustion marble gun.
Its called the "famas combustion"
Its called the "famas combustion"
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ALIHISGREAT
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dude thats one sick looking cannon, dead space could have been a problem but i see he used a burst disc which would counteract the dead space.Pyro Ninja wrote:I believe "experiment_u2" made a nice combustion marble gun.
Its called the "famas combustion"