I have the same size cat 39-1/2’ x 17’. She has a pair of Motenergy water-cooled 48v PMAC motors. Top speed is 6.3 knots. I have 18”x14” 3-blade Hang Shen props and a 3:1 reduction. Max motor RPM is 2,400RPM. I chose the reduction and props after much head scratching using both empirical and tank test data. I am comfortable that I picked right - motor spins up to 2,400 - no more - no less.
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