NOw there's the Intrubuster... with extended barrel well over 200J!!!

How would you build a Pistelle X68?

Mod an HDR68? Build from scratch, air powered?

That is a really interesting construction method. Thank you for sharing!

more please...

Best pipe is the pipe you have

Joerg brings it!!!

I bought an hdr68 to mod for something like this but a co2 pepperbox in 9mm ready built for 99 euros is exciting!

nice yeah a co2 tank can take some significant pressure for a hybrid operation!

As someone who has pressurized ABS Cellcore enough to wring 800fps from a sprinkler valve, I'm not exactly Mr. Safety, but I do wonder what your reservoir/chamber is made of. Can you make your barrel from that?

If you just really like the smooth walls of the plastic pipe you can reinforce it by ...

Yes it's like the difference between an Otto cycle engine and... an air engine

Sweet launcher, lots of well thought out details!

I agree with Hectmarr that is a neat way to build a check valve.

Fun stuff... when I try to design along these lines I end up returning to crossbows though.

Hmmmn just when I thought I had no interest in hybrids

would love to get a look inside

Fun project!

To empty the charge you can have a bleed valve attached anywhere the launcher is pressurized. Also you could have a separate bleed valve attached to a fill nipple.

It sounds like you want something like a conventional airgun to launch the spear? Maybe a spear with a tail that seals ...