Spinning Lego Propellers

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Thrust testing some Lego propellers and rotor blades.
At the end I try to get a tandem helicopter build (externally powered) up in the air. Enjoy!

Tested parts:
-Propeller 2 Blade 9 Diameter [2952]

-Technic Rotor Blade Large with 3L Liftarm Thick and Black Rubber Tip [99013pb01]

-Propeller 1 Blade 14L with Two Pin Holes and Four Axles [89509]