[Land-speed] Fwd: Amazing Dolphins/Non LSR

[BWANA343 at aol.com]

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 My approach to LSR is much more on the Aero emphasis, due both to  how 
interesting it is to me, and the success of vehicles I've found do the  homework 
and the subsequent advantages they've gained. I've watched  this video many 
times, really can't get anything practical out of it  except for being further 
humbled by nature, and hope there's a practical  application ,maybe in a vortex 
generation device. Enjoy, I hope  
Bob W

 
 
 
 
 
 
 
 

The  attached video is of dolphins playing with silver colored rings which  
they have the ability to make under water to play with. It isn't known  how 
they learn this, or if it's an inbred ability.

As if by magic  the dolphin does a quick flip of its head and a silver ring 
appears in  front of its pointed beak... The ring is a solid, donut shaped 
bubble  about 2-ft across, yet it doesn't rise to the surface of the water! 
It  stands upright in the water like a magic doorway to an unseen  dimension.

The dolphin then pulls a small silver donut from the  larger one.  Looking at 
the twisting ring for one last time a bite  is taken from it, causing the 
small ring to collapse into a thousands of  tiny bubbles which head upward 
towards the water's surface. After a few  moments the dolphin creates another 
ring to play with. There also seems  to be a separate mechanism for producing 
small rings, which a dolphin  can accomplish by a quick flip of its head.

An explanation of how  dolphins make these silver rings is that they are 
'air-core vortex  rings'. Invisible, spinning vortices in the water are 
generated from the  tip of a dolphin's dorsal fin when it is moving rapidly 
and turning.  When dolphins break the line, the ends are drawn together into 
a closed  ring. The higher velocity fluid around the core of the vortex is at 
a  lower pressure than the fluid circulating farther away. Air is injected  
into the rings via bubbles released from the dolphin's blowhole. The  energy 
of the water vortex is enough to keep the bubbles from rising for  a 
reasonably few seconds of  play
time.





 
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[demime 1.01d removed an attachment of type application/octet-stream which had a name of BlowingRings.wmv]