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surfbroker said..Warnsey said..
I have been thinking about this a little, given that I am thinking of a big board for the quiver.
Do the laws or relativism apply? I am wondering if there is much difference between someone who is 65-75kg riding a 9'1 to 9'6 board opposed to a 90 -100kg rider (i'm guessing a fair few of us!) riding a board around 11ft.
Yes Warnsey, I've thought along these lines as well..
I'm a lightweight at 65kg and my longest board is 9'1"..so does that equal a 95kg person riding a 12'+ board.
Bigger guy = Bigger board..sort of makes sense...one for the Einsteins of the world to address

I also believe getting the size of your board right is the best starting point.
Setting aside your ability, you're just not going to get waves unless you're on equal footing to everyone else. So if the boards to small, you won't get waves, if the boards too big, it may not perform on the wave the way you want it to.
Below is a size chart for the Banana model made by Harbour, Rich Harbour has been in his shop making boards since about 1959, so he should know. I find it very accurate for my limited ability because when I was 240 lbs, the only board I could ride was 10.2 x 24 x 3 5/8.
The board Harbour recommends for that weight is 10.6 x 23 1/8 x 3 11/16
Although my board was shorter than recommended, it is wider, so overall, my board probably matched the chart recommendations in terms of overall volume.
So how did I get it right? Did I read the chart? Nope.
I just kept buying boards that were wrong, and wasting a lot of money until I went to a shaper and said, "these are the sizes I want, this is the blank I want you to use, you do the rest" The shaper did not agree, but he did it anyway and I finally got a board that I could ride.
That's not belittling the shaper, because apart from the size, it was his job to get the plan shape right, the rails right, the nose and tail widths right, and most importantly, the rocker, and tail and nose lifts right, and he nailed them all.
I probably should have looked for a chart like this years ago, it would have saved me a lot of money.
Moving on, I'm now under 210 lbs and that board is now starting to feel as if it's too slow for me, so once again, the chart seems to be in the ball park.