I saw that video. It's completely awesome! It's the ultimate pneumatic cannon and pushes the performance to the extreme by doing a variety of special things to get there. I loved it. I wonder how a hybrid cannon would do. I'm thinking a simpler and cheaper hybrid could be made that would out perform...

LOL. Cool video! If you want to blow your own mind, build a metered propane cannon with a chamber fan. Probably get around 120 meters per second with pretty much perfect reliability.

I bought the Ceda S and just shot it across the living room. Hoooly crap! I knew what to expect in terms of FPS from reviews online, but I was still totally surprised at how fast it shoots. My kid's nerf blasters just sort of float the dart across the room, and this thing rockets them in a straight ...

So anyway, here I am wanting a nerf gun. My kids bought some and now I want one! But I want a more powerful one. Anyway, I might do some modding at some point, but I'm looking for the best performance out of the box. I've narrowed it down to 3, but sadly, one is out of stock. #1 - Dart Zone Pro Mk 1...

Some pictures would help me to think..

I'm wondering if temperature could be the culprit. I imagine the propane being cold, and maybe it causes the piston housing to shrink while the piston itself has a different coefficient of thermal expansion, causing it to shrink less than the housing? If there are o-rings, they might stiffen as well...

I'd use air personally for a pneumatic. Do the issues arise when using air?

Any chance of some pictures and a description of how it works?

Beautiful work!

A streamlined projectile could be interesting. I think the mass would have to be relatively low and use a sabot, like a dart or something. Could possibly go supersonic with some effort. It would be interesting to see how much pressure is needed to push past the sound barrier with a golf ball. I know...

These types of cannons generate high pressures and have to consist of strong metal construction. PVC or any other plastic will explode. The concept works. Several of us have built cannons like this with good results. The performance benefit is huge and the spring force doesn't take away from the per...

Those are amazing pics. Imagine the journey that comet has been on and the story it would tell if it could.

Those are beautiful.

SpudBlaster15, I'm dying to know what you have in mind. Spill the beans! I don't have access to much space at the moment and it has been a long time since I touched any spudgun related building materials and tools, so I might just throw together a quick, easy QEV pneumatic to see if I can jumpstart...

Daltonultra, I don't recall seeing that thing. It's an absolute monster! That thing can really chuck a can. I'm working on a new design and I was going to make it big enough to launch soup cans, but I decided to make another soda can launcher. I already have a soda can launcher though, so maybe I sh...