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Controlling a thruster's performance in this way could, for example, Vibram Five Fingers Kso Trek useful on missions to Mars, say the researchers. They suggest that almost no other propulsion technology can match this versatility. "The principle looks very attractive," says Michael Winter, an expert in electric propulsion at the University of Stuttgart in Germany, although he wants to see real thrusters, not just calculations, before Men Vibram FiveFingers Sprint Pure Red Shoes to a firm judgement. "Before real hardware is built and tested, almost every thruster looks promising," he says. When Gilchrist presented his design in late 2005 at an electric-propulsion conference in Princeton, New Jersey. Winter says there was intense discussion of the potential problems. For instance, each of the million Men's Vibram Five Fingers Classic in All Black so thrusters on a single chip must he supplied with its own stream of nanopropellant. Solving the complex plumbing problem this creates is a huge challenge. How do you stop the particles clumping together and clogging the channels or valves? And how do you Men's Vibram Five Fingers Classic in Black/Grey/Brown fluid evaporating or sticking to the particles as they are extracted? Gilchrist says that adjusting the surface properties of the nanoparticles to make them repel liquid or other particles could help solve some of these problems. Another open question is what material to use for the nanoparticles. "We're looking at that now," Gilchrist says. While carbon nanotubes have some obvious virtues - they can become highly charged and that means they should be easy to extract from the slurry and accelerate - they could become tangled and clog the delivery system.