Sorry for posting on old threads but ive been kinda researching divergent convergent nozzles and came across this video.

http://www.youtube.com/watch?v=ohURkDRLxj4

You guys have probably seen this but I though this was a great video of the application of a de laval nozzle in a burst pneumatic ...

I have a new area to explore for sf. Railgun and coil gun technology. If we can incorporate an efficient rg/cg then we could really ramp things up with spuds. Also the technology to actually miniturize railguns could come from this website!! We COULD make history!!

Btw to fire a non magnetic object ...

Ile look into it, I was thinking i may have to build my own casing for the piston and motor whilst also also creating away for me to auto cool the motor using the inlet as a means to move the air through.

Thats awesome!! Now i dont have to make a motor and i can pillage the compressor for parts so i can pimp it out. (What pimp really means is to make a larger piston chamber to pump more air with each stroke so its compatible with much larger chamber sizes, also i will probably have to increase the ...

I was wondering if anyone had ever built their own portable compressor, so I researched and found nothing. I then decided I liked the idea of plugging in a compressor into my cannon making it very easy for me to experiment with full auto/semi auto in the future.

The idea is on all my chambers for ...

Thx I just might and hopefully i can get my gun together and upload some pics to add to the data base.

Omg thank you for the vid that blow forward bolt is awesome!

Also this will be my first metal build and i wanted to make it special i also dont have an ebay account cause im useless like that.

Oooh ooh I wonder if i could place that blow forward bolt in my coaxil! I could place it in-side the ...

Thx guys I guess i was getting ahead of myself. I saw in one of the pneumatic showcases someone made a sniper rifle that was breach loading with a mag. I thought i might give it a shot and came up with that extremely fiddly plan.

Though I like the idea of a semi auto it would be extremely silly I ...

I have a project in mind this is my project.

A copper coaxil piston air rifle.
It will consist of a 3/4" barrel and 1 1/2" chamber.
Barrel lenght: 45cm
Chamber lenght:20cm
Pilot lenght:5cm
Ammunition: Corks and Cork sabots (probably try out different fillings for the sabot)

30 cm of chamber and ...

Thx and im sorry for posting pointless questions, I now understand Hybrids better. It seems it would extremely complicate the system i have in mind if i undergo a hybrid. Though now i have a few ideas to still utilize the flint lock method in conjunction with a piston valve.

I will be back and i ...

Amazing thx! Btw i have some more questions are you willing to answer them, they are about ammunitions (also im not sure if im aloud to talk about ammo here).

Thanks also is there anyone who has tryed to make a true Hybrid. One that can both independently run of Pnematics and combustions efficiently without the use of burst disks?

Im trying to make a cannon that is small and portable. The main idea is efficieny. Also could you link me to a post that has the piezzo ingniter info I'm interested in how it works. But anyway ile think of something though having no experience in Hybrids apart from what i have gleaned from wiki and ...

So the problem here is the ignition will take to long. Ok ive come up with a soloution. Would it be possible to place a tight fitting concave piece of copper atached to the piston, that has been covered in iron facing the inside of the barrel. Then have the flint placed around the inside of the ...

Hey i have been tossing up an idea involving a flint hybrid cannon. Im thinking of using a Coaxial piston valve design. The idea is I place iron on the back of the piston and flint on the back of the pilot chamber, so when I vent the pilot both pieces come in contact creating a spark. Would this ...