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@VikingChieftain @joesticker

The technology wasn't ready for the Army competition, and anyway neither of the (USA) based competitors had experience with it yet.

However, the basic technology is easy for any existing conventional helicopter company to adapt. The side props are really just like tail rotors, just with the shafts going out to the sides rather than to the rear.

The X3 itself was not an optimized design, but rather a modification of their Dauphin helo.