i am also a heavyweight just under 100 kilos now and about 6'1"
on lakes i still use my original longboard - in order to be able to go upwind and get back home - i adapted the base to be able to handle my 8.5
when i started shortboarding, there were no local starboard reps. i ended up with a 160 liter board and my old sails for one year. the next year i purchased a new 8.5. i use this sail in 20-40 kph or about 10 to 20+ knots. i purchased an older 7.0 that fits on the same mast and use it in 30-50 kph winds or about 15 to 25 + knots. if it gets really hairy i try to use a really old 6-oh, but in those 30 knot winds anything will fly and the board is really NOT suited for that. I knew that i wanted to windsurf in any winds - so, i actually purchased a used 10-oh race sail that i plane with in 10 to 15 knots. obviously this quiver was built over the last 3 to 4 years.
my favourite sail is the 8.5 - probably cuz it is no cam , light and corresponds well to both my weight and winds in the area.
i started looking at 120 to 130 liter boards to use in bigger winds, but that is after the 3 to 4 years on the 160. i was able to get in the harness when i started and already knew how to plane. i still do not go in the footstraps, but manage to get quite fast just the same. i push against the side of the board - have some kind of phobia about getting stuck in the straps.
in summary , the 140+ should NOT sink, to start bigger was better for me in my conditions.
just trying to give you my perspective, but my heavyweight buddy felt he should have started with a 140+ board
plenty of perspectives and trying if you can is the BEST
joe windsurfer @ 100 kg
2006 AHD type-F FF 160/79cm, 2002 BIC Techno Formula, 2000 Fanatic BEE 124 LTD + Mistral Equipe I LCS
HSM Fire 6.3, Gaastra Flow 3x 7.0, TR-6 8.4, TR4 10.0
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