SpudFiles

I am doing a copper valve piston air cannon and as pilot works a normal blowgun "DG-10" and tee`s ID is 32mm and barrels ID 20mm and OD 22mm and pilot volume is something 10cm3-15cm3+tube`s volume that goes to the blowgun (something 5cm3) and my question is that,does the blowgun exhaust fast enough to launch valve?

the blowgun is fast enough but i would use the largest possible ID for the pilot tube

BigGrib wrote:the blowgun is fast enough but i would use the largest possible ID for the pilot tube

No, low ID, a higher ID will create a higher pilot volume. The flow of the lower ID tubing will still beat the blowgun unless it's stupidly narrow, and the low volume will exhaust quicker.

I have to ask... are you a UK resident? It's just when you say 22mm copper, that immediately rings bells.

Anyway, that should work as long as your piston is a good fit. If it's too loose, you might loose some power.

Ragnarok:I come from Finland antd that`s why I speak bad english .

Why not get rid of the hose altogether and use an elbow like this.

Makes a nice ergonomic position for the trigger too.
Edit: Just realised my blowgun is a dg-10 also

Gunner wrote:Ragnarok:I come from Finland antd that`s why I speak bad english .

It's actually pretty good. I've seen much worse from people who speak it as a native language.