A New Stable Multicopter Avoiding Crashes without the Detection of Rotor Failure -- A New Direction in Multicopter Design --

What is it about?

We present a new concept of another type of multicopter, where, both of the double rotors in the coax at each corner of the “Quad X” rotate in the same direction, i.e., both the upper and the lower rotors rotate, in either clockwise (CW) or counterclockwise (CCW) direction. We name the new one “Octo Coax 2X”. In comparison with a traditional “Octo Coax X”, there would be four novel advantages of our “Octo Coax 2X.” Firstly, the “Octo Coax 2X” can continue on one hundred percent steady flight path, even when all the acting four rotors have failed, in contrast to an “Octo Coax X” that have two or three rotors fail before crashing in most of the cases. Secondly, in the case of the “Octo Coax 2X”, rotor failure does never disturb the balance of the yaw axis. Thirdly, for the simplified flight controller (FC) of an "Octo Coax 2X", we can use the FC of a “Quad X” with four signal outputs, although the FC for the “Octo Coax X” needs a complicated FC with eight signal outputs. Fourthly, an “Octo Coax 2X” can continue stable flight even with not more than four failed rotors, without detecting them.

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