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Like a clock, innit, where there is an hours rotor and a minutes rotor and a seconds rotor. Inside of each other.
'Cept on the copters they go in different directions.
Because all copters need two rotors, because if they only have one, they spin once they get into the air, because of some sorta physics law of perservatory of motibles or something like that.
So cheap ones have the tail rotor, and the ones xoB makes have two big 'uns on either side so they can carry a lot of good guys, and these fancy-schmancy Russian ones have them on the same axis like a clock.
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