My 23 CC was installed with a 20.5"Suzuki prop. Lightly loaded I hit 5850rpm's and 51mph. MPG is unreal at 27mph like 3.60-3.7. My issue was offshore in rough weather at 20mph she was trying to stay on plane at 2900 rpm's and wallowed a bit.
I switched to a 18.5" factory watergrip prop. RPM's came up to 6000. Speed dropped to 49.5mph. I have a bimini top, radar arch and Garmin radar. I also have a bracket which I believe adds 2mph. Now my offshore performance is 3300 rpm's at about 20mph and overall better low end performance and I have bottom paint.
Do not try a 4 blade. Raise that bitch THREE holes!
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Capt. Brian
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