Powerful new magnets have revived efforts to build a quiet propulsion system for ships and submarines.
An MHD drive featured in the 1990 move The Hunt for Red October starring Sean Connery"If you think I'm doing The Hunt for Red October, the answer is yes," says Susan Swithenbank of the US Defense Advanced Research Projects Agency .
Called a magnetohydrodynamic drive, the system has no moving parts at all - just magnets and an electric current. Engineers have been working on MHD drives for decades and the original concept dates back to the 1960s. The Yamato project showed that much more powerful magnets would be needed, plus more robust electrodes - the parts of the drive which make contact with the water.
Metal corrodes when placed in seawater and an electrical current accelerates that process. Some types of magnetic field have the same corrosive effect.Jeffrey Long, a research chemist at the US Naval Research Laboratory , is a battery specialist, and is expecting to take part in the Darpa programme, along with colleague Zachary Neale.
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