for me the MS TR-4 10-oh sail gets me planing in about 2 to 3 knots less wind
with my AHD 160/79cm board this means around 12 to 13 knots
people are saying i should even be planing in 10 knots !!
with my 95 kilos, the MS 8.5 no cams sail starts planing around 15 to 16 knots
the 10-oh is manageable to about 18 knots
after that it becomes work and flys - it can do more - it's me
i am purchasing a used SB Carve 121 to experience this lighter feeling
my understanding is the sweet spot for this board is 5.5 to about 7.5
not sure this would plane in the same wind ie 12 knots
in summary : diminishing returns depends on where you live. when i go out with my 10-oh, there are usually few or no windsurfers. kiters maybe. and the sail is not so large as to require a massive fin - works with a 53 cm race or 47cm weed fin
so far i have NOT regretted the purchase of my 10-oh, 520 mast and carbon boom. it gets used about 45 % of my outings (12 to 18 knots) and my 8.5 another 45 % (15 to 20 knots range)
no idea how a 107 liter board could ever be my largest board
light wind is the majority of my sailing
with 95 kilos 6.0 and 7.0 are used only 10 % of the time !!!!
my w/s buddy who is 105 kilos and 6'4" stops at 8.5
says 10.0 is too heavy and not worth the investment
so, it all depends on the person and the place :-)
joe windsurfer @ 100 kg
2006 AHD type-F FF 160/79cm, 2012 JP SLW92, 2000 Fanatic BEE 124 LTD + Mistral Equipe I LCS
HSM Fire 6.3, NS Duke 6.9, TR-6 8.4, TR4 10.0
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