Defense Tech: A SUPER FAST, (SUPER LOUD) MINISUB »
Posted By gbudavid 4 months ago in Science & TechnologyThe 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.
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alanocu4 months ago
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From the looks of that thing, I could see them using it in the new remake of Tron. That's bad-ass.
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