posted on Jul, 29 2009 @ 05:50 PM
A while back someone posted some info about super cavitation and torpedos mentioned.. Since it is new to me I thought it may be new to others
From Defensetech.org >>
A SUPER FAST, (SUPER LOUD) MINISUB
The Day (New London, CT) on Monday had an intriguing article about DARPA's Underwater Express. This program aims to prove engineering approaches for
a manned minisub able to carry high value cargoes submerged at 100 knots -- a "super-fast submerged transport," or SST. Underwater Express was
announced with a request for proposals in 2005. The RFP specified supercavitation, a form of enhanced submerged propulsion exploiting a self-made
vacuum cavity or gas envelope between hull and ocean to reduce flow resistance by "60 - 70%." Supercavitation, such as used in the Soviet-Russian
Shkval rocket torpedo, is extremely noisy. Even allowing for a breakthrough in how the gas cavity is created and maintained, the classic
power-versus-speed formula makes it highly likely that only a rocket engine could achieve the required 100-knot speed for the SST. Yet the RFP
mentioned nothing about silencing the technology demonstrator minisub.
After a competition, General Dynamics Electric Boat was awarded a contract which by completion is expected to total $38 million. The deliverable will
be a quarter-scale unmanned version of its winning design, to be demonstrated in the waters off New England in spring 2010. The demo is to include
runs at up to 100 knots for 10 minutes, with maneuvers to show that the SST is safe at such speeds. GDEB says they've solved the challenges of
maintaining a stable gas envelope while accurately controlling the test vessel's depth, course, angle of attack, and speed. Details are top
I'd been wondering what good there might be to a manned minisub that, unlike a rocket torpedo, has to be reusable and survivable -- but which would,
whenever moving fast, make a huge passive sonar signature, broadcasting its presence to any enemies for miles around. Besides, what missions would it
be used for that couldn't be done by a HALO insertion and Osprey extraction, or for that matter by a slow moving battery-powered mini like some
Improved ASDS? When The Day's article came out, I decided to ask a source. The rest of this is my interpretation of the answers I got, sprinkled with
public info and my own conjectures and commentary.
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