Do you have power/speedRPM info from your diesel? This will help you predict correct reduction and propeller diameter. Your 72v motor will gave a top speed of 3,600RPM if, for instance, you had a cruising speed if 6 knits with a propeller speed of 900 RPM with existing prop, you can do the math to figure out reduction - somewhere around 4:1 in this instance.
My 40’ cat weighs over 20,000# and has a pair of Motenergy 48v/10kW motors using a 3:1 reduction with max prop RPM of 800. My max speed is 6.3kts with max cruise of 6 knots.
my guess is you’ll find you can cruise at up to 6 knots - but it will require a big battery if you’re going more than an hour or two. I have a 48v/1,000AH Winston LFP pack. I figure I have a max range of 25NM at 5 kts.
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