RE: iS133 vs iS122
Surely planing threshold depends on too many variables that we don't know.
Sail type, fin shape and area, rider skill. Region and steadyness of wind are also factors to take into account. Also most people never really measure wind speed so make a best guess. This makes it hard for people to give a good figure. Remi has done his best to help.
I weigh roughly the same as you and can get my iS115 planing with an 8.5 Lightning in roughly 13kts but usually this involves picking the edge of a gust. Once up I can keep going in less. Hopefully you can judge what would work for you based on your own experience of the 133 and others suggestions.
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