RE: Biggest sail on the FT-138
Good point. The 138 is a lot narrower in the tail. Still, my 148 is only 67cm wide and I go with a 70cm in light winds. Maybe you could get up to 64 or 66cm without an issue. Again, find someone's fin to try out. You might be surprised. I'd suggest getting an R13 or R14. I find the R14 I have does get me on a plane sooner than my R13, but it is also 2cm longer. The R13 rails up much nicer and gets me going over the chop. With the larger fins, you'll want to have your straps set as far out as possible. With your weight, I assume you have relatively small feet, so this shouldn't be an issue. I'm size 10 (US scale), which should be a 42 for those in Europe. My heels don't drag at all.
The only reason I keep pushing the longer fins, is to get you the most out of the board for the lightest of winds.
Starboard [Gemini, F-Type 148, iSonic 105], AHD [Convert 60, GT Special 73], Windsurfer
Neil Pryde [v8 9.8], Sailworks [Retro 8.0; Hucker 6.6, 5.6, 4.8]
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