Search found 17 matches
- Tue Jan 15, 2013 7:03 pm
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
- Tue Jan 15, 2013 6:57 pm
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
So at first the coaxial design did not work. I removed the "spike" at the end of the barrel-seal, and it improved. I further refined the barrel-seal with gasket material, rather than a machined rubber stopper, and it began producing vortex rings just as well as the "T-Valve" cannon did. However, I'm...
- Fri Jan 11, 2013 5:17 am
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
- Fri Jan 11, 2013 5:11 am
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
The speed of sound is a very relative thing, and varies greatly depending on the gas you are using, the heat and pressure of that gas, etc. It holds that a projectile cannot be propelled faster than the speed of sound in the propellant gas. The "weird physics" that accounts for an air-powered gun sh...
- Thu Jan 10, 2013 5:42 pm
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
- Thu Jan 10, 2013 2:30 pm
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
- Thu Jan 10, 2013 4:20 am
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
SO. Where I left off, I belive I was complaining about the shape of my cannon, the speed of the valve, and the size of the air tank. And I've decided to upgrade to a 4" coaxial piston valve cannon design. This will give a more uniform flow into the barrel from all directions, provide the smaller tan...
- Thu Jan 10, 2013 3:51 am
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
- Wed Jan 09, 2013 4:07 pm
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
- Tue Jan 08, 2013 2:59 pm
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
- Tue Jan 08, 2013 12:34 pm
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
The military did try this :) The project was canceled after a year, because there was just not enough progress to justify spending more on what was already a kindof silly project. The problem is twofold: The army was trying to dispense powdered agents with the gun they designed. These powders are of...
- Tue Jan 08, 2013 3:10 am
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
In an ideal gas, the speed of sound would depend on the gas, and temperature. However, air is not an ideal gas. The increase in density at high pressures leads to increasingly prominent deviations from its behavior as an ideal gas. At ~3000 PSI, such as in some of the PCP guns, this effect could acc...
- Tue Jan 08, 2013 2:49 am
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
The speed of a projectile is limited to the speed of sound in the propellant gas. In an air cannon, this would be at or around the speed of sound. In a combustion gun this can be significantly higher than the speed of sound, depending on the temperature of the combusted gasses (the speed of sound in...
- Mon Jan 07, 2013 5:26 pm
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
- Mon Jan 07, 2013 4:00 pm
- Forum: Pneumatic Cannons
- Topic: Experimenting with a REAL DIY vortex cannon!
- Replies: 47
- Views: 26307
I see exactly what you mean, almost like those conical "aerospike" rocket nozzles that have cropped up in recent years. That may be on the list, but for now with the smaller tank volume, its making great, accurate, and repeatable vortecies at 100-110 PSI. Counting frames, and with a 65 foot shot to ...