Flight involves climbing at some point...
That the lift might be ten times as much as the thrust confirms that the pitch pivot point of the whole aircraft is in the wings and not near the nose...
This inevitably means leverage issues comes into play to tilt the prop...
Tilting the prop does require beating over half of the prop's thrust... Otherwise one half of the disc will not move back compared to the other half to allow what is called a tilt from the original path...
Note that on a high wing aircraft, the "pitch pivot point" could be nearly above the prop disc, which could change the leverage issues significantly...
David603 still put it in the simplest, clearest way:
"So in the simplest possible terms, the prop is trying to drag the aircraft in a straight line, and the more power is applied the more successful the prop will be in doing this, thus reducing turning ability."
BTW, I've noticed you've suddenly dropped your indignation at my suggestion that fighters might have pulleys...
Gaston
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