Both torque and airflow are being changed.
So far as what is causing the trim change in pitch....it is the spiral airflow. Torque is oriented on the roll axis, not the pitch axis.
Regards,
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Dave Lockhart
Team Horizon/JR/Spektrum/ThunderPower, Castle Creations, F3A Unlimited, NeuMotors, Central Hobbies, Tech
This model appears to have pretty straight airflow.