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@VikingChieftain @joesticker

I think the Eurocopter X3 (and Airbus RACER) is a more promising configuration. It's like a conventional helicopter, but with two props to the sides rather than one tail rotor. In hover mode, one of the props thrusts in reverse so the pair act like a tail rotor. But in forward flight they both thrust forward, for superior efficiency and speed.

Compared to tilt-rotors, the X3 configuration is almost as fast and greatly superior in other aspects.

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