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mathew said..Francone said..mathew said..
Francone, can I quote you?
"...perhaps help me to reach the planing threshold" and "Planing is not, by far, my first priority"
Which way is it?
Exactly what I said : by reaching the planing threshold I meant getting close to it, without necessarily
getting on the plane, if the condtions ( or my skills) are not there. Nice if I could, of course, but if I am speeding along at speed X knts/hr and I need X + 3 knts /hr to plane, it would still be perfectly O.K. by me...I wouldn't have an existential crisis by being..3 knts/hr away from planing.
As a matter of fact, most of my windsurfing is done subplaning , not even close to planing, but still a lot faster(and more enjoyable) than paddling..
I was only wondering whether by rigging a larger sail, like a 9 or a 10 , I could go faster and perhaps plane. Or maybe I would be confronted with the limits of the board's design, certainly not made for speed and planing, no matter the size of the sail.. It may be a reality.
That response still doesn't make sense -> "... existential crisis by being 3kn/h away from planing". Either you want to plane or not.
However... what you didn't mention in your first post, was that you are using a windSUP. To answer your direct question- yes... you will have more power, but you wont plane any easier (maybe you might get the board going faster another half-knot). Indeed you are hitting the limits of design -> longer waterline, narrow, curved rocker, weight. You will be able to get it to plane, with enough wind.
As others have suggested,at 15kn, 85kg and 8m sail, you just need something like a 130l board. aka:

Yes, but there are different jobs, as well, and planing isn't the only one !
Many people are so bent on planing as the sole dimension of windsurfing, that they cannot conceive of any other way of w.s.
You say I don't make sense because quote " either you want to plane or not". This is a false "either... or" : as much as one may want to plane ( and I would very much like to..) one may also have to consider subplaning as a convenient " plan B", when the planing conditions are not there, either because of the equipment you have or because of the the winds and you don't want to sit on the beach waiting for them...
And you would certainly want to subplane as efficiently and as fast as you can , within the constraints of your board, of the weather and your own skills...This is why I was thinking of a larger sail or a more light winds friendly board.
The problem is that just about all the boards to day are spinned as light winds boards , even when they are ridiculously short and wide, which should be antithetic to light winds because of the drag. There must be a reason why many seasoned sailors are going back to long and narrow longboards.
Please note, too, I didn't say I'd have an ..existential crisis , if I am 5 knts/hr away from the planing threshold .
This may be well be what planing-addicted sailors feel when they cannot plane. In fact I have seen too many of them sitting on the beach in 12, even 15 knts winds, with a ...gloomy face, waiting for the Godsend, while I was still cruising on my Windsup, slowly but still pleasantly. Certainly more pleasant than sitting on the beach.!.
What I did say, quite to contrary, is that I would NOT have such an ..existential crisis (!?) crisis,: if another board ( or the same board with a larger sail) could allow me to subplane at 6 or 7 knts/hr instead of ,..2 or 3, as perhaps my current board, it would be perfectly acceptable to me, even though I may quite far from the planing threshold.
Francone