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03-15-2009, 05:11 PM
| #1 |
| Senior Member  Join Date: Aug 2006 Location: A Swede living in Glasgow, Scotland
Posts: 15,138
|  Science..... Is it possible and what would it take to travel supersonic submerged?  Just thought that I'd pick your wee brain cells! 
__________________  JAN "Felicis Tredecim" "I´m going back to the front to relax" "THE BLACK CATS FLIES TONIGHT" "Find your enemy and shoot him down - everything else is unimportant!" "When you're out of F-8's... You're out of fighters!"  |
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03-15-2009, 05:39 PM
| #2 |
| Senior Member  Join Date: Sep 2006 Location: Dordrecht
Posts: 3,834
| Hmm, I doubt it, in water sound travels with a speed of around 1500 m/s, compared to around 330 m/s in air. The hig speed combined with the the enormous density of water vs. Air, the amount of friction will be sky high.
__________________  " The knack of flying lies in learning how to throw yourself at the ground and miss." |
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03-15-2009, 06:04 PM
| #3 |
| Senior Member Join Date: Jan 2009 Location: United Kingdom
Posts: 1,762
| Tricky one the sonic boom (through air) is created by the compression of air in the wake of the aeroplane creating it, compressing the gaseous state of the atmosphere to near-liquifaction. Water, unfortunately, doesn't compress; the wake of a hydroplane attempting mach speed could be quite damaging or even dangerous to shore-based life or surface vessels. As for actually accomplishing it regardless of collateral damage, I don't think it would be a problem from a hydrodynamics point of view but I've no idea how much energy would be required from a powerplant(s) to overcome water as a medium to mach speeds. This factor would increase far more radically with depth than altitude would for an aeroplane. Last edited by Colin1; 03-15-2009 at 06:07 PM. |
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03-15-2009, 06:15 PM
| #4 |
| Minister of Whoopass   Join Date: Jul 2004 Location: Long Island Native in Mississippi
Posts: 17,498
| If u could create a vacumn in which the vehicle would travel, sort of like a bubble surrounding the craft, friction would be irrelevant... Maybe use sonic waves to create a bow wave infront of it, parting the water in front of the craft???
__________________  My IL2 Video Tribute to My Grandfather: http://www.youtube.com/watch?v=HtzN5RuNNJk |
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03-16-2009, 02:19 AM
| #5 | |
| Senior Member Join Date: Sep 2006 Location: Dordrecht
Posts: 3,834
| Quote:
 The bubble would have to move, too, so you'll still get friction. Another interesting philosophical point here is, if the craft would be in vacuum, wouldn't it be always faster than sound, since the speed of sound is 0 or non-existant in vacuum?
__________________ " The knack of flying lies in learning how to throw yourself at the ground and miss." Last edited by Marcel; 03-22-2009 at 11:09 AM. | |
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03-22-2009, 12:40 AM
| #6 |
| Senior Member Join Date: Jan 2009 Location: South Shore of Nova Scotia
Posts: 304
| Les is thinking in the right direction. Supersonic submersibles are not only theoretically possible, but also likely to be technically achievable in the not-to-distant future. Here's a link that gives an outline of the general theory and principles involved: Supersonic Underwater Vehicle? JL |
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