This video demonstrates the how a Tricopter will react differently with with an without counter rotating props. Without counter rotating props, the torque from all 3 motors are additive and the rear motor must lean to the right to vector thrust to the left to counter the prop torque and the the aircraft must bank to the left so the front motors can counter the leaning back motor. This reduces efficiency and control. Leaning both front motors during installation can reduce or elimate the lean, but the propellers are still at an angle and the control and efficiency is still reduced.
When the front to motors rotate in opposite directions the counter each others torque and the rear motor only needs to lean enough to counter its own torque. Note how little the rear motor tilts in this configuration. This allows nearly all the thrust to be used as lift and less to be used to counter propeller torque. This will maximize efficiency and control is not hampered.
In summary, both configurations will fly just fine. The dicision to choose either configuration will be based on propeller availability, cost and preference.
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