SpudFiles

http://www.break.com/index/giant-vortex ... thing.html

I just saw this video and thought it would be a cool build one a little smaller. I dont know if anyone else has gotten into this.

We had mentioned the idea a while ago

I did see that and was about to share it here today as well, lol. It is really cool and I thought about making a vortex barrel for my cannons.

Do you actually think that was real? I'm a bit of a cynic and think someone found out how to use the extra buttons on their vid cams and video editing freeware.

It's a real oxy-acetylene cannon, froma BBC series

[youtube][/youtube]

The Germans came up with a working prototype many years ago though it was unfeasible for the anti-aircraft role it was designed for.

ralphd wrote:Do you actually think that was real? I'm a bit of a cynic and think someone found out how to use the extra buttons on their vid cams and video editing freeware.

It's real.. no doubts.. Worked with some high power acoustic stuff in my past. The audio reveals the source of the blast is oxygen and acetylene. The initial burst is strong enough to generate that. The cone is right from rocketry. It has a linear taper because the combustion is done in the combustion chamber, not primarily in the nozzle cone. There is nothing in the video to indicate any part of it was fake.

In creating a sound pressure field, a sphere of speaker drivers equal distant from a point and driven in phase can create some very high peak SPL standing waves. In combustion at the focal point, you get interesting results. The physics for the experiment is sound.

If they filled the cone with smoke, they could launch a visible smoke ring at high speed with that. Just seeing the condensation ring is impressive. The shock wave pressure gradient is huge to do that. That thing is LOUD.