Search found 1551 matches

by Moonbogg
Sun Nov 10, 2019 9:22 pm
Forum: Pneumatic Cannons
Topic: Pressure testing hydro
Replies: 13
Views: 3398

Re: Pressure testing hydro

Yep. Do the honey method, my friend. Screw all that complicated stuff. Plumb some high pressure honey into that sucker and wash it off your lawn in 2 minutes = job done. Also, I've heard it said you can reverse the cup seal inside the grease gun so it will seal with water. I tried that on a small, c...
by Moonbogg
Sun Nov 10, 2019 2:03 pm
Forum: Pneumatic Cannons
Topic: Pressure testing hydro
Replies: 13
Views: 3398

Re: Pressure testing hydro

OK, some thoughts here.... 1 - Actually you *can* fill it with water and then pressurize with air but you absolutely have to do this one dead nuts correctly or things can go badly. Most folks haven't the know how or equipment to do it right and there are other techniques that are easy to do so unle...
by Moonbogg
Sat Nov 09, 2019 5:54 pm
Forum: Pneumatic Cannons
Topic: Pressure testing hydro
Replies: 13
Views: 3398

Re: Pressure testing hydro

You can't fill with water and then pressurize it with air. If it fails it will explode. You have to fill it with water and then pressurize it with more water or grease from a grease gun. I'd suggest getting a nice large grease gun and modifying the seal inside so you can fill it with water and use i...
by Moonbogg
Wed Nov 06, 2019 6:53 pm
Forum: Pneumatic Cannons
Topic: Introduction and My First Pneumatic
Replies: 28
Views: 4322

Re: Introduction and My First Pneumatic

Chicken :wink: :bom: Far from it, Moonbogg is just acutely aware of potential material failures and their negative consequences, and on this forum definitely the one who goes the furthest to make sure nothing is left to chance, which is laudable in my book. I do the best I can, but also my nano-sui...
by Moonbogg
Tue Nov 05, 2019 9:27 pm
Forum: Pneumatic Cannons
Topic: Introduction and My First Pneumatic
Replies: 28
Views: 4322

Re: Introduction and My First Pneumatic

800psi+ ? Yikes. I'll see myself out.
by Moonbogg
Mon Oct 28, 2019 6:51 pm
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1462
Views: 81925

Re: Short question topic

The weight of the gun resulting in an increase of muzzle energy? I'm not seeing it...
by Moonbogg
Sat Oct 19, 2019 3:57 pm
Forum: General How-To & Discussion
Topic: "In the world of spuds today"
Replies: 2406
Views: 133533

Re: "In the world of spuds today"

Whoa, that thing looks awesome. Looks like a sub machine gun, lol.
by Moonbogg
Sat Oct 19, 2019 3:52 pm
Forum: Pneumatic Cannons
Topic: French pneumatic mortars in WWI
Replies: 26
Views: 13211

Re: French pneumatic mortars in WWI

Yes, the simplicity and avoidance of having to machine so many intricate parts came to mind. If they had the resources then it's not an issue I suppose. Less parts to fail with a simple piston might have been attractive as well. I don't know how they got their compressed air though. Probably some so...
by Moonbogg
Fri Oct 18, 2019 10:15 am
Forum: Pneumatic Cannons
Topic: French pneumatic mortars in WWI
Replies: 26
Views: 13211

Re: French pneumatic mortars in WWI

Those are frickin awesome. My first drafting job was drawing and designing pressure relief valves for ships. They looked very much like that pop-off valve. Also, I think the French would have enjoyed the simplicity of modern barrel sealing designs that use air pressure to seal the valve. Cool to thi...
by Moonbogg
Thu Oct 17, 2019 7:36 pm
Forum: General How-To & Discussion
Topic: "In the world of spuds today"
Replies: 2406
Views: 133533

Re: "In the world of spuds today"

I thought by now I'd understand how a combustion works, but I can't figure out why there are two camlocks on this thing. Also, is that an aluminum section in the middle? I have a soft spot for combustion cannons. Let's get some details on this creation...
by Moonbogg
Tue Oct 08, 2019 12:14 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1462
Views: 81925

Re: Short question topic

Oh my god, of course you don't need a valve, lol. I thought they needed one, but I don't know why I thought their chamber was sealed and air tight. With no projectile, it's open. I'm looking forward to your oxygen propane fun. Keep us posted!
by Moonbogg
Mon Oct 07, 2019 5:04 pm
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1462
Views: 81925

Re: Short question topic

You solved the problem perfectly. He is trying to fuel the cannon but there is back pressure coming from the chamber, preventing proper flow of fuel and air into the chamber in the correct ratio. Well done. Wow, what an easy fix that would have been. I thought they had to build a whole new cannon, b...
by Moonbogg
Sat Oct 05, 2019 2:25 pm
Forum: Hybrid Cannons
Topic: Destruction video
Replies: 8
Views: 2187

Re: Destruction video

Ah, finally! Some proper damage :D what were you shooting in terms of projectiles? All 12oz sodas except for two lime shots from the small barrel. Fun times. EDIT: Also, I think the flow of the valve is limiting performance of light weight projectiles from the large barrel. Soda cans seem to do rea...
by Moonbogg
Thu Oct 03, 2019 9:15 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1462
Views: 81925

Re: Short question topic

Yes, it looks good and is a nice size. I don't think they realized how powerful it could have been with a proper fuel mix.