Search found 10 matches

by Luke31
Thu Nov 26, 2020 2:11 pm
Forum: Pneumatic Cannons
Topic: Tilted valve allowing greater flow?
Replies: 1
Views: 60

Tilted valve allowing greater flow?

I stumbled across this valve while going through MyAirCannons.com videos. Its a tilted valve that's supposed to allow better air flow. Manufacturers video https://www.youtube.com/watch?v=_yxZQOc20WY This video at 0:30 and 3:15 the MyAirCannons guy explains how it performs alot better. https://www.yo...
by Luke31
Sun Nov 08, 2020 2:07 am
Forum: Pneumatic Cannons
Topic: PVC Primer/Glue says DO NOT TEST WITH AIR
Replies: 8
Views: 771

Re: PVC Primer/Glue says DO NOT TEST WITH AIR

Go to the thread below and scroll down a bit. Click the zip file for GGDT. It stands for Gas Gun Design Tool. The other one is HGDT (Hybrid Gun Design Tool). Hybrid's are pressurized propane and air cannons and are a different beast altogether. Anyway, get familiar with GGDT and entering inputs for...
by Luke31
Sun Nov 01, 2020 9:53 pm
Forum: Pneumatic Cannons
Topic: PVC Primer/Glue says DO NOT TEST WITH AIR
Replies: 8
Views: 771

Re: PVC Primer/Glue says DO NOT TEST WITH AIR

There is a modeling program we use called GGDT. It can reduce the burden of trying to do all sorts of MATH and will allow you to just design your cannon. I don't have the link on hand, but it's around here somewhere. There is a similar program called HGDT used for combustion cannons. I used the pro...
by Luke31
Wed Oct 28, 2020 7:19 pm
Forum: Pneumatic Cannons
Topic: PVC Primer/Glue says DO NOT TEST WITH AIR
Replies: 8
Views: 771

PVC Primer/Glue says DO NOT TEST WITH AIR

When I saw it on the back of the can, I wasn't sure what to make of it since so many people online were building air cannons using PVC. There are charts online that list the pressure rating for different pipe sizes. So I make sure to stay below those ranges. But if the manufacturer themselves are pu...
by Luke31
Wed Oct 21, 2020 1:16 pm
Forum: Pneumatic Cannons
Topic: Concerning video of a Piston Valve Cannon bursting
Replies: 10
Views: 668

Re: Concerning video of a Piston Valve Cannon bursting

I found another video of a piston valve designed air cannon from someone else with a similar size Do you think his can suffer the same fate as theres?

by Luke31
Wed Oct 21, 2020 1:11 pm
Forum: Pneumatic Cannons
Topic: Concerning video of a Piston Valve Cannon bursting
Replies: 10
Views: 668

Re: Concerning video of a Piston Valve Cannon bursting

There's a lot of mass in a 3" piston, and PVC is fragile. The break at the barrel end was clean and exactly at the stress riser where the reducer meets the valve body, looks like shock fracture rather than pressure rupture. Lesson to learn - don't do that. I found this image on google under stress ...
by Luke31
Tue Oct 20, 2020 8:09 pm
Forum: Pneumatic Cannons
Topic: Concerning video of a Piston Valve Cannon bursting
Replies: 10
Views: 668

Concerning video of a Piston Valve Cannon bursting

I came across this video of a piston valve air cannon bursting. https://www.youtube.com/watch?v=6la9301dW9o All of the pipe appear to be schedule 40, they even said it only had 90 PSI in it, which is very concerning. Someone please shed some light on what might of happened. I was about to build a si...
by Luke31
Tue Oct 20, 2020 7:59 pm
Forum: Pneumatic Cannons
Topic: Piston Valves Explained Visually
Replies: 177
Views: 133291

Re: Piston Valves Explained Visually

I came across this video of a piston valve air cannon bursting. https://www.youtube.com/watch?v=6la9301dW9o All of the pipe appear to be schedule 40, they even said it only had 90 PSI in it, which is very concerning. Someone please shed some light on what might of happened. I was about to build a si...
by Luke31
Sun Aug 04, 2019 4:11 pm
Forum: General How-To & Discussion
Topic: Water pressurized spud gun?
Replies: 4
Views: 1711

Re: Water pressurized spud gun?

mark.f wrote:You can have water fill a tank and displace and pressurize the air into a smaller chamber. The only problem is you have to drain the tank every time and you're limited to your municipal or well water pressure.
I'm not sure what you mean.. You will have to explain a bit more.
by Luke31
Tue Jul 23, 2019 1:33 pm
Forum: General How-To & Discussion
Topic: Water pressurized spud gun?
Replies: 4
Views: 1711

Water pressurized spud gun?

Has anyone made a spud gun that uses water pressure as the propellant? Or a water and air combo. I have not seen many examples of people using water in their cannons, its usually all air, or some kind of combustible fluid. Would it work as well as an all air setup? It might work similar to a squirt ...