Oh so Huben uses a fixed magazine? So much for pellet chambering depth and such. 2k dollars for a plinker lol
Came across your full auto blow back 4.5bb gun on GTA, I suppose that can be refined into a selective fire version with a more complex trigger group. What's the power you were getting? And ...

Figured so! I found some animations for the Huben but I'm sure you have a better understanding of it than me? The Huben seems to not have a bolt nor nozzle? Just oring seal on both sides of the mag?

Been a while since I was into PCPs, now I see things like selective fire PCPs shooting pellets instead of just 4.5mm steel BBs.https://www.youtube.com/watch?v=eBvs8Wvu0yg
Is this just iterations of the Huben full auto PCP? Hows the main mechanism work?

I pop up once a while for inspiration.
My most recent experiment was adding hop up to a BBMG and it does work. The hop up was also added to the tip of the barrel instead of the breech.

Man seeing your MS paint dagrams almost brought me tears, it's good to see the forum is still alive and you're still here Jack!

The bleeding will not be possible in my case, I don't have the space for that.
Must say I'm stunt with this. I removed the return spring and the balanced valve would still close and no power increase at all. In fact I'm getting half the power compared to the normal valve

Untitled.png So I built a fairly well made counter balanced valve.
Exhaust 7mm diameter with 9mm piston. Then I compared it to a conventional hammer valve with 6mm exhaust diameter and a shaft of 4mm.
Turns out the balanced valve was weaker. My hypothesis is once the valve is cracked open, the ...

I'll get some photos

So I did more testing, the exhaust is too small and gas in liquid form does not flow and pilot the valve properly.
But even if I fill it will gas in gas form, the piston get stiff after not many uses, the o-ring gets really dry. Any suggestion for o-ring material? Or I should used two o-rings so ...

No, with air is fine. However I'm just trying to learn the reason of it, plus I was hoping to use the launcher quite mobile, the portability of a propane can is interesting.

So I started with a coaxial piston launcher with plans to use solenoid to trigger it. However if I fill it with propane in gas form (filling with bottle pointing upwards) it kinda makes a decent Bang. Then I filled it with the propane bottle upside down so the liquid can get in expecting more power ...

So I started with a coaxial piston launcher with plans to use solenoid to trigger it. However if I fill it with propane in gas form (filling with bottle pointing upwards) it kinda makes a decent Bang. Then I filled it with the propane bottle upside down so the liquid can get in expecting more power ...

So I have been toying around the idea of using propane with solenoid valves and piston valves. However the valve jams every few shoots. The o-rings on the piston are free float and seals fine, but the piston opens very slowly, as if the o-rings are swollen.
Is it because of the cold? Any suggestion ...

Any one could tell me whats these holes on the baffle are for? Like why isn't the hole/cut mirrored? Wouldn't' it cause non uniform turbulence?

Wow, SpaceX! Nicely done!
Fortunately and unfortunately, I just love this sport a bit too much and ended up just being an engineer at Novritsch. No regrets though! and thanks for mentioning! Funny enough I was thinking of when I joined the files last night and what were my first posts so I checked ...