If you like to see a real model helicopter coaxial , must look past here.
http://www.modelltechnik-jung.de/en/products/Kaa-350/index.html
really why. Since both levels have run counter to rotor collective pitch, and therefore no tail rotor is used, the rollers or Yaw does. On the side described in detail the model. Very well done. Quiet visit over.
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