At an average walking speed, it'll probably take you between 3 and five minutes, longer if it's uphill. The limiting factor is going to be how heavy the cannon is, but you can probably mitigate that by fitting it with wheels, at that point it's all down to terrain. Sensible answer, it depends, among...

A while back I started tweaking the design of a standard vortex block. I'm not sure what the specific design style would be called, but I'll just keep this simple and call it a 'block'. The typical design allows the bbs to continue spinning around the center hole until they 'find' the outlet. With 3...

It sounds like you just need a venting regulator if I'm reading correctly.

Hey everyone, I love this site and have lurked for probably a decade now. I've used the resources here to design some lovely hybrid launchers and think the info here is still really valuable to hobbyists and engineers. One thing I've noticed recently is that most links to old topics are unusable – t...

"Does anyone know if it would be possible for the site owners to redirect old URL formats to the correct threads?" It has to be done manually one by one and yes website migration breaks links.

I do what I can when I can as a moderator but the major workings of Spudfiles is the owners (PCGUY) thing.

Topic moved to proper forum section. @Goodtimes42, you have a PM in your inbox.

Hello Gents, I am relatively new to this forum and I would really appreciate any guidance you guys may have regarding optimizing my design. The goal of this project is to launch soda cans (2.6" OD /weight: 13 OZ) at the greatest velocity possible. I have been using the HGDT calculator and I think I ...

Air cannon overview.jpg I love target shooting, and continue to enjoy the hobby, and I also enjoying engineering and building new things. For my latest build, I wanted something powerful that I could also safely use at a park. Multi-shot capability was a requirement as I didn’t want to have to repr...

A spud gun is not an airsoft gun, so I'd say it's extremely unlikely. IANAL, obviously, but given the way things in the UK are going, a spud gun is more likely to get classified by the lads in the penis hats as being an improvised firearm, the sort of thing that could quite feasibly get you 5 years ...

I posted some time ago showcasing a high pressure 'Toolie' style valve I built out of stainless steel. This is the progression of that project. I'm sorry for making a new post, but I figured it'd be easier than modifying my old one. Feel free to move this if needed. shown below is the valve assembly...

Here are photos of 2 test shots done today, in Feet Per Second

Done at 2000psi The mass of this last shot is 147grain. This gives an energy of ~230ftlb. Not too shabby for a bit under half pressure.

Obviously looks great! Speaking to the silencer, are you planning to use the extra length of lower tube for expansion volume? If you're beating your head against the wall trying to figure out how to rifle the barrel, and you have a 3d printer, you can take a look at electrochemical rifling . Good jo...

Thank you! This has been a fun project so far. I believe I'm going to (sorry for the pun) bite the bullet and purchase a .50 barrel/barrel liner to make one with. In an effort to maximize performance, I believe a professionally built (read "highly consistent bore") barrel will be my best bet. As for...

The 0.8:1 ratio comes from burntlatke's testing where chamber volume was held constant and barrel volume was changed, which effectively found the longest barrel length that could efficiently use a certain chamber size.. It is worth noting, however, that latke was using potatoes for projectiles and ...

The 0.8:1 ratio comes from burntlatke's testing where chamber volume was held constant and barrel volume was changed, which effectively found the longest barrel length that could efficiently use a certain chamber size. Increasing chamber size up to a certain point will just lose efficiency. You coul...