It's a Bravo One 1.65:1 outdrive with a Bravo One 26 / 15.25 wheel. Bravo One wheels are typically 1" lower pitch than stamped, so I ran 25P and 26P through the calculator. Results as follows:
25P
WoT RPM=3650
Theoretical Speed = 52 MPH
Actual Speed = 35 MPH
Slip = 1 - 35/52 = 33%
26P
WoT RPM=3650
Theoretical Speed = 54 MPH
Actual Speed = 35 MPH
Slip = 1 - 35/54 = 35%
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