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Vortex rings big and bigger.

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ragnar

Wed Jul 26 2006, 11:55AM

Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425

Brilliant pics Peter, I think you capture the rings very well. Never realised you had a bigger son, either ^^

You mentioned some distances the rings travel... what kind of speeds do you get?

Tesladownunder

Wed Jul 26 2006, 12:10PM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

blackplasma wrote ...

.. I think you capture the rings very well. Never realised you had a bigger son, either ^^
You mentioned some distances the rings travel... what kind of speeds do you get?

Now that I have a good smoke generator I can get really good shots of multiple rings at different speeds including videos. However, they are predicting severe storms tomorrow so I guess they will have to wait.
Bigger son - yep, I tend to lose count. We couldn't afford shoes for him

The slower ring above at 6 foot was actually going backward with the light breeze. A fast one will shoot across our parking area of perhaps 20m in perhaps 2 or 3 seconds. Once I get the video going I can do a frame by frame with distance markers and plot the speed as it slows
I still want to get a candle blowout distance as well
Pic shows the hollow vortex within the larger mushroom cloud. Looks quite like alien eyes when turned vertically. (No Bjorn, I don't believe in things that can't be seen or measured. Heck, I don't even like most aliens

)

Peter

1153915852 10 FT13391 Vortexbigstructure

robert

Wed Jul 26 2006, 12:39PM

Registered Member #188 Joined: Thu Feb 16 2006, 05:18PM
Location:
Posts: 67

Nice.

Had built something similar out of a coffee can and a speaker back some years, with a smoke generator based on a 5w ceramic resistor half-immersed in smoke fluid, which worked more-or-less.
Having tried different pulse shapes and amplitudes, performance was bad and well, the usual hand operated one worked better.I guess the speaker cone didnt move far enough.

Bjørn

Wed Jul 26 2006, 03:06PM

Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058

Do the rings make any audible sound? Mine made a nice buzzing sound at around 50 Hz but I used a small hole and a lot of pressure. I have long since converted the launcher to a VLF antenna so I can't make a recording.

Tesladownunder

Mon Jul 31 2006, 11:56AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

No sound, just the "whummpff" as the diaphragm springs back.
Using a 2 litre milk carton full of smoke is very portable and very cool. Great for public participation.
The commercial smoke generator gives much thicker smoke.

Peter

1154346980 10 FT13391 Vortexbidemptydrive

Pete

Tue Aug 01 2006, 11:20PM

Registered Member #106 Joined: Thu Feb 09 2006, 09:39PM
Location: Portland, OR and Istanbul, Turkey
Posts: 47

Wow. You have to take some video redoing that last picture. It looks so perfect that I would swear it is photoshoped.

Excellent

Tesladownunder

Sat Aug 05 2006, 08:03AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

I have done some videos. Still seems very clumsy on my Pinnacle studio software .
More on my site soon.

Video (860K)shows how it is fired and how far and fast they go for those who haven't seen one in action.

Peter

]1154800100_10_FT1630_vortexwindaioperator.wmv[/ file]

Madgyver

Sat Aug 05 2006, 11:33AM

Registered Member #177 Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214

A little bit late, but here is a picture of me with a somewhat big Vortex cannon. I had pics of it shhoting, though I can't find them right now. I don't have the cannon either, it now belongs to my old high school.

Tesladownunder

Sun Aug 06 2006, 01:42AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

This is an article on vortex rings from Mt Etna possibly 200m diameter and predominantly steam. My physics prof has an interest in vortices (in superfluid helium) and was quite surprised when I told him about these volcanic vortices as he had photographed them himself on Mt Etna many years ago.

Peter

Pete

Sun Aug 06 2006, 10:14AM

Registered Member #106 Joined: Thu Feb 09 2006, 09:39PM
Location: Portland, OR and Istanbul, Turkey
Posts: 47

Dolphins are quite adept at making vortex rings with air out of their blowholes. I was amazed at these things underwater. I was at Seaworld a year ago and watched them make these rings for about 5 minutes before I realized I should turn on my camera and get some video. If anyone knows how to easily convert Apple Quicktime to Mpg, I will post the videos. IF not, I will post the video in Quicktime format when I get home tonight. It really is fascinating.

Pete

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