AIUI there's all sorts of considerations & trade-offs. E.g. the motors have a limit to how quickly they can change output (up to around 400Hz today).
Because there's no swashplate on the upper rotor of those wee co-axial rotor designs, they're really ineffective in cross wind. You can't apply the required corrective input when the top rotor gets blown off axis.
The design I was thinking about puts the lowest rotor below the gravity centre. First, it would lower the highest rotor, and second, crosswind would have the opposite effect on the low rotor. I really expect such a design to be neutral.
Comments
AIUI there's all sorts of considerations & trade-offs. E.g. the motors have a limit to how quickly they can change output (up to around 400Hz today).
Because there's no swashplate on the upper rotor of those wee co-axial rotor designs, they're really ineffective in cross wind. You can't apply the required corrective input when the top rotor gets blown off axis.
The design I was thinking about puts the lowest rotor below the gravity centre. First, it would lower the highest rotor, and second, crosswind would have the opposite effect on the low rotor. I really expect such a design to be neutral.