Plane: twin-motor / asymmetric thrust safety feature.

[AndKe]

Twin-motor airframes may be unable to maintain attitude, if one ESC/motor/propeller fail , and the other is used to achieve demanded thrust. Most will fail if one motor is dead, generating drag, the other work at 100%.

It's better to limit power difference to acceptable level av still have control, even if giving up altitude, rather than flip the plane.

parameter suggestion:
MOT_DIFF_CURR (maximum current difference in (A))
MOT_DIFF_RPM (maximum RPM difference (RPM)
MOT_DIFF_TYPE (selects type, 0= Current , 1= RPM)

logic:
if difference between power-module1 (motor1) and power-module2 (motor2) is greater than MOT_DIFF_CURR then limit the performance of best performing motor (reduce PWM) to be within the (MOT_DIFF_CURR + current of the less performing motor).

, similar logic using RPM, for non-electric, or RPM sensed motors.

[iskess]

See #1861 for similar discussion using rudder.