Hi Hannu,
I think you have missed the point of this thread. There's no dispute that a large, slow turning prop is efficient. So it's not a question of do what you want, more one of do what you can.
That is this thread is about direct drive related to the motors discussed and what prop can and cannot be fitted due to motor constants and the limitations in this situation they impose on prop choice, which decides (V) rpm vs (A) torque and ratios of one to the other based on prop diameter and pitch ratios.
https://en.wikipedia.org/wiki/Motor_constants
John R
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