SpudFiles

Hey guys just fished my nifty little project yea i got permisson from pvc arsenal 17 to use this design but i tweaked it just a bit this has a 3/4 sch 40 fireing chamber and a pinhole delay is 5 seconds depning on what pressures and burst disk i use. the whole thing is made of sch 80 3/4 union, 2 inch to 3/4 inch bushing, 3/4 inch end cap with pinhole, 2 inch coupling , 2 inch plug, it fires flour or baby powder for an awsome smoke effect.hope you guys like sorry about the messy primer job i did it real sloppy, anyways enjoy

Wow, it looks good, but do you mind if I ask you how it works?

i think its a burst disk coaxial sorta thing. then the round hit the ground it ruptures the burst disk and shoots out what ever is in it (probably bb's) thats how i think it works, i could in fact be very very wrong...

I'm guessing that the chamber inside the end cap fills up slowly through the pinhole and when enough pressure is there it triggers the burst disk. Am i right?

take a look at pvc arsenals diagram http://www.spudfiles.com/forums/air-del ... w it works

Thats pretty cool but it would seem that only the air inside the cap would be used when the burst disk triggered. Wouldn't making the area inside the cap bigger and the area around it smaller be more efficient?

no then if i pump 50 psi in it 25 psi will be left in it by the time it fires

So it has 25 psi left in the space out side the cap? Does it bleed out if you let it sit there?

Well at least its easy on the pumping

no its only 25 psi left inside the cap

Look's like you've had even more success than I have! Excellent job.

thanks it was a real pain in the a** to make the pin hole with a sweing needle cause it kept breaking

I made one of those, but I got tired of using it and ended up drilling through the endcap on the inside to convert it to a fairly powerful and portable burst disk cannon.