Ever wonder what keeps teenagers entertained in the digital age? Well, back in my day, it was definitely building potato cannons and launching spuds at targets. The thrill of the project and the satisfying thwack was hard to beat. Good times!

It's not all doom and gloom, I still see the younger ...

Nice! Definitely a lot better than my attempt at a fiberglass combustion chamber.
I'm curious as to why you made the chamber such a large diameter, is the burst pressure of the barrel the limiting factor here due to the pre-preg process, and you can design the chamber to work at a lower pressure ...

There's a lot you need to clarify if you want a better answer, but I'll try and guess. If you are using something like ESP32 it can do bluetooth reception and I2S already so really the only question is what the other two boards look like/need to do.
Example.

Wanna try it?

I will! It would be neat to compare the new version and the old VB6 version of GGDT with chrono data. I have a pneumatic I'm still playing around with, just no free time. :p
Also I remember my physics lab had us make a ballistics calculator in excel back in like 2010, this takes ...

If it's a spreadsheet I would just see if it runs correctly on google sheets. If not just throw it on github. :p
Awesome to hear, btw. I still use both programs from time to time, honestly it's not the most difficult "retro" software to get running.

Update on the current project and a little sneak peek: still lots to do (polishing valve seat, rebuilding piston to track more cocentric, some funny stuff with the barrel, a way to aim more better), but I managed to put a hole in my box spring with some supposedly "low power" testing and a plastic ...

You could look at making a blow-forward bolt which uses the air from the main valve to operate. You can probably see how it works in this animation from clide or this project.

I've been having quite good success with printing 95 TPU seals for old co2 guns. Maybe just lucky....which I'll gladly take. ;)

All I've printed so far is brackets for random projects and project boxes and I've had a 3d printer for a year. :p
I do have some harder TPU (I think it's 95D) I used ...

ITWOST:

Got some new camera gear and figured I'd take a closer look at one of the "good" piston valves I've made recently.

https://youtu.be/SVZjXHcsJnk

There's a lot more work on the completed project because I want to do silly sh*t, but another small anecdote: you ever head of FOGBANK ? It's ...

A very interesting way of doing it for those who are more at ease with 3D printing although I suspect it would be a challenge for rifle length barrels.

I don't think there's much stopping us traditional, ancient hardware store trolls from making the same type of ECM jigs just traditionally ...

Nice job as always, it's funny that I see these projects of yours before I even look at spudfiles because of the yt channel. Beautiful old gun too (well maybe not the stock but who's picky with 60's airguns :p).

Pretty good for a nailgun! :p

I have a few recommendations for the next one, though. That chamber is pretty massive for a 1/2" barrel. If you were to use a smaller pipe size for the chamber (say 40-50mm) you could probably find some better pipe which is either rated for pressure or will hold up ...

Nice cannon! Any plans for using that threaded adapter on the end of the barrel?

Very nice project! Since we're talking about rifling, have you seen how people are using "electrochemical machining" to rifle barrels from steel tubing?

Nice catch!
and nice launcher, neat to see people still building in 2024.