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other yaw stabiliser is needed. These rotors can be laid out as
** TandemOne in front of the other.
** TransverseSide by side.
** CoaxialOne rotor disc above the other, with concentric drive shafts.
** IntermeshingTwin rotors at an acute angle from each other, whose nearly-vertical driveshafts are geared together to synchronise their rotor blades so that they

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