Hi Hans,
6.0 for 75 Kg with a Carve 133 would be good at 16-18 knots.
6.5 " " " " " " " would be good at 14-16 knots
7.0......................................would be good at 13-15 Knots
7.5 m2 (or larger) for anything under 12-13 knots
Hope this helps,
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