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fourTimes

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U.S. proposes to allow drone operation at night, over people 8 years ago
  helicopters with 4x the number of blades
I mean, what’s the difference between a helicopter with four blades, versus the same helicopter by with only one blade, but four times the size?

Except a full scale helicopter blade is easily 100 times larger.

So they are helicopters, but 100 times smaller, but with four blades.

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