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Phil, gee that main rotor DOES look incredibly close to the tail rotor.. be interesting to see if anyone has any tech info on this..
There is a gearbox between the engine(s) and the main rotor;
the same gearbox has a second "outlet" (I don't know the correct english term) making the rear rotor turn. T
his mechanical connection between the main rotor has as very useful side-effect that the main rotor blade is at its closest point to the rear rotor at the moment that the rear rotor blades have just passed.
It's a bit like the WWI fighter machine guns that were mechanically fired by a system connected to the propellor, this way ensuring that the bullets would not hit the propellor.