fourTimes

Re:U.S. proposes to allow drone operation at night, over people on Tuesday January 15, 2019 @02:11AM (#18909337)

  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.