Re: Propeller options
Kahuna:
Thinking of moving up from 19" to 21" prop but your figures bother me. What is your drive ratio? If the 1.65 that translates to over 30% slip! Than again is your plotter reading from a speed transducer or the GPS. If GPS the speed through water is unknown and that's what the boat speed really is. Don't blow my head off for mentioning the obvious but are you reading MPH or Knots? (the plotters will read whatever you choose or has been set.)
If we go to a more reasonable 10% slip, than true hull speed - through the water - for a 21" wheel is 41.6 which allows for a 9 mph current, not unusual, moderate in fact in tidal channels but then do you have much tide or current issues in Hawaii? The Latitude suggests little tide but plenty opportunity for currents.
HBH
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