Simple button valve

[Glickman]

Yeah i was kinda going towards the point of that you can shoot at very low pressure or High pressure low volume and still be rather fast. Its all bout effeciancy i guess.

Did u know its impossible to shoot 1200 fps (mach 1) with normal air?

i disagree



god help anyone who doesnt know what that is (i swear, even at 9 and 13, my sisters had no idea...)

[trains are bad]

HAHAHA

if you make the barrel of you LAW short enough, it comes to a point in the curve where dwell doesn't matter. Even infinite dwell will still not shoot hot. Do this by testing carefully and cutting a bit at a time. This works if you have a single load you will be using like a nerf rocket. This is not very air efficient but is a very simple/cheap/light/handy way to build one with a simple valve. It's just a matter of holding the valve until it clears the barrel and trying to let go soon enough to keep some air.

[ojhspyro89]

HAHAHA

if you make the barrel of you LAW short enough, it comes to a point in the curve where dwell doesn't matter. Even infinite dwell will still not shoot hot. Do this by testing carefully and cutting a bit at a time. This works if you have a single load you will be using like a nerf rocket. This is not very air efficient but is a very simple/cheap/light/handy way to build one with a simple valve. It's just a matter of holding the valve until it clears the barrel and trying to let go soon enough to keep some air.

A problem with that is air effeciancy. After the projectile leaves the barrel the access air in the tank/chamber will be dumping into atomospheric pressure pretty fast which would just be a loss of air. The best way to do it is get a 2 to 1 ratio of chamber to barrel. That is the way to get maximum performance out of a pneumatic cannon. You also might want to go download GGDT. Its a program to simulate and help design pneumatic air cannons. Its a very helpfull program but you need to know alot of random things like dwell of the valve you use. Its a very nice program

Oh and the Mach 1 thing with normal air is the air isnt fast enough it cant expand fast enough to push out the projectile that fast. Now if you heat it up or use a lighter gas like helium you can acheive speeds of mach 1 and above. Its been done before with compressed air and propane mix. dont try it ull get hurt lol.

[Glickman]

A problem with that is air effeciancy. After the projectile leaves the barrel the access air in the tank/chamber will be dumping into atomospheric pressure pretty fast which would just be a loss of air. The best way to do it is get a 2 to 1 ratio of chamber to barrel. That is the way to get maximum performance out of a pneumatic cannon. You also might want to go download GGDT. Its a program to simulate and help design pneumatic air cannons. Its a very helpfull program but you need to know alot of random things like dwell of the valve you use. Its a very nice program

anything is better then a 1-shot depletion of a 12 gram , ill look into that though

[JoshK]

Could you do that...but have it go into a chamber that has a little gauge on it? Once the gauge goes to a certain pressure you let go of the button, and either open a lever or push another button?

Also....I don't know much, but how would you make sure there is a tight seal inbetween the part with the whole, and the red part?

[JoshK]

i disagree



god help anyone who doesnt know what that is (i swear, even at 9 and 13, my sisters had no idea...)

That be bad stuff...

bad stuff + big boom bomb = tons of s in our future generations...

[doc_Zox]

my internal piston design:


PVC liability issues caused me to go with an aluminum MKX:

[Glickman]

Could you do that...but have it go into a chamber that has a little gauge on it? Once the gauge goes to a certain pressure you let go of the button, and either open a lever or push another button?

Also....I don't know much, but how would you make sure there is a tight seal inbetween the part with the whole, and the red part?

i was thinking of that too, and for the second part, o-rings i could show you waht i had in mind, but thats more crappy drawing i would have to do



thanks for the blueprints im gonna see if i can simplify that

im trying to make a simple single tube design, easy to carry on my side

[TheTramp]

doc zoc's launchers are wonderful but far beyond most people's ability (or pocketbook ).

Here's something that the average guy could make. Obviously it's not painted in this picture and I hadn't cleaned up the hose and wires yet.