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consider the direction of travel of the paddles while in the water......
if they're at or near center, you have thrust up and down, as well as forward, as they move around circle.
the higher the hub is above the surface, the thrust of the paddle motion gets more exclusively directed to the intended direction.......
yikes, that's an awkward sentence..........
Anyway,
look at pictures of old paddle wheeler boats........they were designed for maximum forward thrust using this system.
Obviously, we can't do it prefectly, but, the closer the better.......
Just my random thoughts.........
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Henry:
I don't know where I'm going, but, I'm on my way...........
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