SpudFiles

well gbb pistols use propane/green gas they only have i guess a few cc of liquid that can fit in the grip, that's kinda useless the only thing you can do is test it out to see how your valve need to get the velocity you want or just make the gun and then fill the rest with little chamber every tied to gather and hope for the best.

also post pics of this new valve your taking about.


edit: GGDT wont get hes using liquid gas

As for using GGDT it does not work as Crna Legija said,
and agreeably I think that It will be quite trial and error when making it, but I just wanted something to base my thoughts on so I start off on the right track!
as for pictures of my valve they are coming soon, just polishing my designs on g-sketchup.

(sorry for editing a few times... might be a bit confusing for some)

Not sure, but look around.

cammyd32 wrote:GGDT does not have propane on it, does it?

No, but you can model your own gas. I'm not entirely sure how tough.

o, but you can model your own gas. I'm not entirely sure how tough.

can you? are there tutorials anywhere cos if I can get GDDT to work it might be quite useful

You could send D_Hall a pm. He's the creator of GGDT and HGDT. He surely knows how to use his own program

You could send D_Hall a pm. He's the creator of GGDT and HGDT. He surely knows how to use his own program

Yeah good idea I will do that, but the problem still stands. just on average how much gas does a bb gun use?

Mine uses about 250 cc of air per shot. Those numbers will be different on each bb gun.

Cool thanks for that, would you say there were any problems with gbb guns? cos I have heard that they are more likely to jam but I don't know if that is down to mechanism or something that the liquid gas does to the system.

I'm not very familiar with bb guns, as I live in a country where they are illegal.

The first thing that pops up in my mind when you are talking about problems with gbb guns, is that it might have too little time to load the bb before the slide returns, thus jamming the gun.

The gun I was talking about is my 6 mm musket. It has a barrel of 80 cm.

Cool thanks for that, I will think about that when I come to design that part of the gun. thanks

Sorry for double posting but I felt it needed a new post,

Here is the url for my g-sketchup model of my valve i will be using http://sketchup.google.com/3dwarehouse/ ... revstart=0
I color coded it for easy manipulating so you can cycle it by selecting the bolt component and moving it, so you can see see how it works.
I did not include the springs as it was a real pain to put in, but they are easy to imagine there.