Nanotech Products Hitting the Market
stdin writes "Saw this on SFGate. Nanotech's first fruits are nearing the consumer market." Not little machines, yet, but a variety of products using very small components.
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You're assuming nanomachines use ejection-based engines. Perhaps it would be better to use less-efficient forms of propulsion like propellers or even legs. Also, you're neglecting the fact that (in general) the machine is makings its way through a relatively dense medium. Most of the force would be spent displacing the thousands or millions of atoms in the path it is trying to follow.