Is the reason because the deviation of the rotors axes , in the case of a birotor or a trirotor UAV is not manageable?
Does the configuration of the aerodynamic forces become random?
As number of motors are lower, there is insufficient lifting force. Yaw mechanism is also a vital factor. Tricopter has more yaw authority comparing to a quadcopter. What that means is when a quadcopter or hexacopter yaws, they do so by slowing down half of the motors and speeding the other half. If the copter is already at full speed (all motors at 100%), it will have to lower the speed to make yaw happens. However on a Tricopter, it uses a servo to achieve yaw so it loses less thrust when the same situation happens.
Thank you dear Shamudra for your answer. I totally agree with you.
In fact, there is the problem of vertical flight that requires sufficient engine power. For lateral flight (roll and pitch), engine power is not enough. It is necessary to tilt the axes of the motors. This makes the stabilization of a birotor or a trirotor more difficult compared to the case of a quadcopter.
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