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Problem is, micro anything usually isn't good unless we're talking about electronics.
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What's the problem? Electricity should be used for comamnd and control. Thermal managment should be passive. Lighting and power tools aren't really significant, are they?
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Economies of scale favor making ever larger turbines, because a small increase in radius exponentially increases the swept area...
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Funny you should mention that.
An Ugrinsky turbine that take power from the rim not the shaft, or a horizontal axis like that Ferris wheel in London. And a serpentine coil that uses tightly packed coils not the hand wound coils he's making, or even square conductors like the new hairpin motors.
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That just triggered the hypothetical question -- what if the solar infrastructure treated light as a wave instead of a particle? 4x the efficiency?