http://www.tech-faq.com/supercavitation.shtml

cant find more info but seems that osnis are human as well

"The first application of supercavitation techniques was in World War II Germany, when supercavitating torpedoes were designed and tested, although never used during the war.
After World War II, only the Russians and Germans were reported to have supercavitating weapons systems - the Russians had Shkval torpedoes which used a rocket engine to achieve speeds of 200 knots underwater (with part of the rocket exhaust being directed to the front of the torpedo to help form the supercavitating bubble). The Germans, on the other hand, started deployment of their supercavitating torpedoes in 2004.
Russia also had an assault rifle for underwater work used by their frogmen or combat swimmers, developed around the same time as the German HK P11 underwater pistol (which is used by German, Dutch, Israeli, Danish and Norwegian combat divers, as well as units of the British SAS and US Navy SEALS and other special operations groups."

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id only dive with sharks if i had one of these machine guns

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and in the end air is a fluid would be posible to use supercavitation on air?

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have you everd heard of 200 mph submarines?

they exist and they are public

http://www.networlddirectory.c...log/Oct-29-2007.html

"It's always been tough to make submarines go all that fast due to the drag they get when trying to plow through water. It's a lot heavier than air. But the smarties at the Pentagon might have figured out a way around that little problem.Their new speedster sub, dubbed the Underwater Express, can go 127 miles per hour as opposed to the standard sub's top speed of about 29 mph. Well, it separates itself from the water by encasing itself in a giant gas bubble. The bubble can move through the water quickly, with no drag on the sub itself. Technically, the process is known as super-cavitation. "

quote:

Originally posted by raaaid:
id only dive with sharks if i had one of these machine guns

Don't be such a coward! These little Honduran girls are harmless...











--Outlaw.

P.S.
This one's not Honduran...

Back on topic...

So what part of super cavitation don't you get? It's an old concept and the simple question of "how does it work" is well explained with info. easily obtained from a google search.

Feel free to look up the definition of cavitation before asking whether or not a bullet fired in the air could utilize such a concept.

--Outlaw.

You must be referring to this...

http://www.globalsecurity.org/...systems/an-aws-2.htm

Fairly simple as I understand it...difficult to pull off but simple concept. Encase the torpedo/projectile/submarine in an air bubble. Less drag in air so the object moves faster so long as its in the bubble. Fast torpedoes could change underwater warfare significantly.

quote:

Originally posted by raaaid:
and in the end air is a fluid would be posible to use supercavitation on air?

Yeah, it's fluid, but it's gass, not liquid. (Super)cavitation phenomena can obviously occur only in liquids, not gasses.

The bigger the object, the faster it must travel to achieve supercavitation (since it needs bigger bubble), that's why it's much, much harder to achieve it for whole sub as opposed to a relatively small, rocket powered, one time use torpedo.

I have read in the past that these supercavitating torpedoes could achieve unheard of speeds.

RR had a merlin powered torp

How did they prevent cavitation from the prop TT?

The big caveat with supercavitating torpedoes is control, they are fast but due to the cavitation they are hard to control, since conventional rudders will not operate. Not too much of an issue if the have nuclear warheads though .

quote:

Originally posted by VW-IceFire:
Fairly simple as I understand it...difficult to pull off but simple concept. Encase the torpedo/projectile/submarine in an air bubble. Less drag in air so the object moves faster so long as its in the bubble. Fast torpedoes could change underwater warfare significantly.

I have seen some diagrams in the past of these torpedoes, and the controlling fins protruded past the area of cavitation and into the water.

quote:

Originally posted by roybaty:
The big caveat with supercavitating torpedoes is control, they are fast but due to the cavitation they are hard to control, since conventional rudders will not operate. Not too much of an issue if the have nuclear warheads though .

Due to their own speed and relative unmaneouverability and size of their targets, guidance isn't that important - it can be used as an unguided weapon. I've read that Russians didn't export the guided version of the Shkval, only the unguided. Allegedly, guidance is performed via thrust vectoring, and via thin control surfaces which protrude out of the bubble and into the water - as Choctaw said already.

this is interesting a crab through cavitation produces temperatures of the sun:

http://journals.iranscience.ne...rg/20011006/fob3.asp

i think we have no idea of the current tech we have for being most secret

i bet for example there are supersonic subs

im thinking currently into the ultimate weapons which will never come out:

time travel and psionics

for example something that involves the two happens to me at least 30 times a day during the last 7 years:

im able to know what word im gonna hear within 2 seconds even after a long silence

sometimes i just think about it others i have such conviction im gonna hear it that i have time to make a joke about it and when the word sounds its funny

but i think time travel not to be such awesome weapon due to paradox, you just cant change the reason which made you time travel because if it was changed you wouldnt time travel with which you just coulnt change the thing in 1st time

if you were past to kill your grandfather you wouldnt even be able to pull the gun like if your muscles were sleep to move in certain direction since just pulling the gun might change it all, and paradox just doesnt happen

instead psionics could turn people into soemthing greater than superman

hey this sounds very nazi doesnt it?

i wonder what nazis researched into making themselves supermen

they were interested in alchemy and the real objective of alchemy was not gold nor eternal life but the knowledge, another way to call enlightening

i read a lot on alchemy, a recenbtly deceased chemist dr gave a book on alchemy to my fathers by himself which i read with pasion:

theres a secret practical method to achieve enlightening that anyone could use

theres an elixir that expands youth undefinely

theres a projection dust that turns mercury or lead to gold

these are secret for obvious reasons

quote:

Originally posted by raaaid:
theres a secret practical method to achieve enlightening that anyone could use

Books.

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theres an elixir that expands youth undefinely

Sense of humor.

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theres a projection dust that turns mercury or lead to gold

Marketing.

quote:

these are secret for obvious reasons

Non-existence.

Logically thinking..

If you push forward with a force, you'd need a greater force pushing forward to create the required air gap.

Nice idea but the bullet/torpedo/missile would go backwards down the tube...