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Thanks Fischer53, I think I am not getting all the performance I should if you can do 41 with 70hp. My extra 5hp ought to be worth a bit more than 2mph above that.
I don't have a hydrofin, and I've looked at the propulse props Putershark mentions. I am not sure if 4 blades would give me better performance or not, and I wouldn't consider stainless steel. The propulse props are more expensive than aluminum props, but it may be worthwhile getting one of them. My understanding is that the fourth blade adds to your torqu, but sacrifices some speed. Is that correct?
woodNfish
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