I fold a double layer of T-shirt material over the front of the golf balls. Works well with the 44mm internal diameter of my barrel.

[url=https://flic.kr/p/XdYNRW][img]http ... .jpg[/img]P1070480 by Terry Griffiths, on Flickr[/url]

Nice build and great WIP pics.

Great build and damage pics/vid.
Thanks for sharing.

Thanks. Seems to fire every time as long as the pressure in the meter pipe is 35psi and gives consistent power shots. I guess the swoosh of gas out of the mete pipe into the chamber is enough to mix it up. I might try some "chamber change" to see if it makes any difference in performance. I will chr...

The idea is that it can be fired from the hip...not actually done it yet but will give it a go at the weekend...i have gathered a pile of stuff that is just begging to be destroyed

Thanks. I didn't want to compromise the tank by cutting a big hole in it for an internal fan and vent valve so the blower was what came to mind. It works rely well, run it for a couple of seconds and chamber is all vented. It blows air in to the chamber via the metering pipe and is isolated by means...

https://farm5.staticflickr.com/4396/37081552825_482b62160c_z.jpg P1070488 by Terry Griffiths , on Flickr https://www.flickr.com/photos/154623046@N06/36911207372/in/dateposted-public/ Collecting bits for a while, finally got round to putting them together. Mostly all used parts. Spec: 8ltr high pres...

Thanks again JSR. Ordered a 2" and a couple of 1" sprinkler valves off Amazon lastnight and 100 b grade used golf balls off ebay, already have a blow gun and plenty of sch 40 fittings so a plan is taking shape.

Thanks jacksmirk that looks like a good starting point for a big bore project, seems like pretty impressive performance for such a low pressure. How much difference in performance does the second sprinkler valve make in actuating the main valve as apposed to just the blow gun? Also is the double air...

Made this a while back as an afternoon project with my boys... Now gathering bits for something a bit more sophisticated. First off...KUDOS for taking time to build stuff with your kids. 8) Secondly..."more sophisticated" as in....??? Thanks, i was a bit ferrel as a kid but had freedom in my dads s...

an afternoon project with my boys lucky boys, great job! The spring-loaded ball valve is an underrated way of achieving high power with commercially available parts, well executed. Thanks for the reply, i realize it is about as basic as it gets but it cost me nothing and thought the boys some good ...

Made this a while back as an afternoon project with my boys from used plumbing bits that were lying in my shed so material cost is basically nothing. Never really did any research prior to constructing it but it preforms so well for something that took a few hrs and no outlay it made me start lookin...