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  1. HariPrasad-1

    First look at ultra-fast Sikorsky/Boeing SB-1 Defiant dual-rotor helicopter

    I love this design. counter rotating blades knocks off the torque generated which requires tail rotor to balance it. Tail rotor will balance the torque by consuming some 15% engine power. Now Chopper blade is divided into 2 counter-rotating blades so that there will not be any need to have...
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