Search found 1695 matches

by Moonbogg
Fri Nov 19, 2021 2:40 am
Forum: Pneumatic Cannons
Topic: Designing a inline piston pressure regulator - Fluid statics math model
Replies: 19
Views: 1331

Re: Designing a inline piston pressure regulator - Fluid statics math model

You can use X-shaped o-rings to reduce friction. I use them on my piston with standard o-ring compression and I can easily move the piston by pushing it with one finger.
by Moonbogg
Wed Nov 10, 2021 2:32 pm
Forum: Pneumatic Cannons
Topic: Designing a inline piston pressure regulator - Fluid statics math model
Replies: 19
Views: 1331

Re: Designing a inline piston pressure regulator - Fluid statics math model

Personally, I have only made hybrid cannons and I never had to understand how a pressure regulator works, so I don't know how a pressure regulator works. The ignorance isn't by accident. When I can, I let the rest of the world do the thinking and heavy lifting for me. The pistons in a hybrid are ver...
by Moonbogg
Tue Nov 09, 2021 6:02 pm
Forum: Pneumatic Cannons
Topic: Designing a inline piston pressure regulator - Fluid statics math model
Replies: 19
Views: 1331

Re: Designing a inline piston pressure regulator - Fluid statics math model

That's a lot of work to go over. Not sure you'll get many bites to be honest.
by Moonbogg
Mon Nov 08, 2021 7:09 pm
Forum: Pneumatic Cannons
Topic: Air Cannon Design Help
Replies: 4
Views: 557

Re: Air Cannon Design Help

Download GGDT (gas gun design tool) and use it to model the cannon's performance. Look around in the pneumatic cannon section for design ideas. I'd imagine a piston cannon would be a good choice. Air is thick and soupy, so a large enough piston is needed to avoid choking the thing off, maybe around ...
by Moonbogg
Tue Nov 02, 2021 10:41 pm
Forum: Pneumatic Cannons
Topic: Air Cannon Design Help
Replies: 4
Views: 557

Re: Air Cannon Design Help

What's your budget?
by Moonbogg
Mon Nov 01, 2021 7:19 pm
Forum: Ammo & Parts
Topic: Source for Thin wall 1.5" pipe
Replies: 5
Views: 646

Re: Source for Thin wall 1.5" pipe

Oh, apparently I read ping pong ball but my brain saw golf ball.
by Moonbogg
Sat Oct 30, 2021 4:16 pm
Forum: Ammo & Parts
Topic: Source for Thin wall 1.5" pipe
Replies: 5
Views: 646

Re: Source for Thin wall 1.5" pipe

I use 1 1/2" SCH10 aluminum pipe for golf balls. It's basically perfect.
by Moonbogg
Fri Oct 29, 2021 6:00 pm
Forum: Ammo & Parts
Topic: Does Ice Bullets Actually Work?
Replies: 5
Views: 499

Re: Does Ice Bullets Actually Work?

I'll give it a google to find out. I think you'd have to try it out yourself. Also, if you were going to use them you'd have to carry around a freezer with you, right? Remove bullet from freezer, quickly load and FIRE! I think it would just shatter into dust and water vapor if shot from a real gun, ...
by Moonbogg
Tue Oct 12, 2021 10:12 pm
Forum: Pneumatic Cannons
Topic: Latest Eclipse Defense 37mm Pneumatic
Replies: 8
Views: 823

Re: Latest Eclipse Defense 37mm Pneumatic

The legend returns! Looking nice, Solar. I hope to see some video action at some point.
by Moonbogg
Thu Sep 16, 2021 5:07 pm
Forum: Ammo & Parts
Topic: What caliber ammo is most available In 2021?
Replies: 3
Views: 3215

Re: What caliber ammo is most available In 2021?

Potato caliber, lime caliber, golf ball caliber, and soda can caliber are all readily available in my local area.
by Moonbogg
Tue Sep 14, 2021 6:09 pm
Forum: Hybrid Cannons
Topic: Wires and Walls.
Replies: 2
Views: 1584

Re: Wires and Walls.

I've drilled holes and fed wire through an aluminum chamber and used epoxy to seal it. It's been 12 years and it still works. Another more recent cannon I made uses a spark plug. Drill and tap a hole and stick a spark plug in there. Well, the spark plug went through an end plate, not the chamber. Bu...
by Moonbogg
Sun Sep 05, 2021 2:37 pm
Forum: Hybrid Cannons
Topic: MAPP Gas Safety
Replies: 3
Views: 920

Re: MAPP Gas Safety

I'm no expert, but people have used MAPP gas for combustions and hybrids for a long time. There's no issue compressing MAPP gas in a metering pipe for fueling a cannon as long as it's a metering pipe and not some kind of tank where you add MAPP and AIR (or any form of oxidizer) for a pre-mixed fuel ...
by Moonbogg
Mon Aug 30, 2021 5:48 pm
Forum: Hybrid Cannons
Topic: Thoughts on my piston valve design
Replies: 41
Views: 10601

Re: Thoughts on my piston valve design

Are the fittings aluminum? I'm not familiar with the fittings you are going to use. I also don't know why commercial fittings are given the pressure ratings that they have. With PVC it's obvious, but if galvanized iron says 150psi then that seems strange to me but I'm sure there's some reason. Maybe...
by Moonbogg
Sat Aug 28, 2021 11:02 pm
Forum: Hybrid Cannons
Topic: Thoughts on my piston valve design
Replies: 41
Views: 10601

Re: Thoughts on my piston valve design

Based on your shown areas, I got 1143 psi chamber pressure for equalization, so the same that you got. It looks like this is an estimate though because it looks like you clicked the surfaces and there are chamfers on them, so the actual diameters will be a little larger, but it should be pretty clos...
by Moonbogg
Thu Aug 26, 2021 2:53 pm
Forum: Hybrid Cannons
Topic: Thoughts on my piston valve design
Replies: 41
Views: 10601

Re: Thoughts on my piston valve design

Good to see you back. Designing is a big part of the fun, so I look forward to you working on it some more.