This is a Mike Birt question
I bought a 133 x 42 Dundee from a friend. I'm liking it! Weighing in at 73 kg (160 lbs) I was initially concerned about it's size in 20 plus conditions. At first it wasn't an issue right up to 28 knots. Now that I find myself riding faster and harder, I find the 133 a little big.
That's normal.. if you push the board speed up at high power loads, then it starts to overpower your ankles and flatten out...
Being more of an all around design, and correct me if I'm wrong, but I get the sense that having a bigger board (133 Dundee) doesn't necessarily qualify it as a light wind machine. And in the process, I lose too much on the high end for the few knots on the low end, thus narrowing it's range for light riders like myself. I get the feeling that the 133 isn't so much a light wind board for lightweights as it is more of an all around size for bigger riders.
It's not like it's designed that way, but from your weight I can see how you can see it that way.. and you are right.. But at early stages in the sport 42 will be a perfect size for you to get going and you'd make 2x the progress in the time given..
I believe I'd get better range and comfort with a size or two smaller. The question is would it make that much of a difference to jump to 131 x 41? ... Can 1 cm in width make that much of a difference? I'm considering the 129 x 39.5 but don't necessarily want a high wind only board.
You weigh 73kg, go for the 40 wide, no question. 1cm does not make that much difference to what you use at the moment and where you are in the sport. It's time to get the right size for your weight, and that is 40 wide..
I have a 135 x 39 North X-Ride that has great range, but it doesn't have as nice a ride as the Dundee. I'm using this board as a reference.
It's the same size as the 40 wide dundee more or less, but from the perspective of your weight the feel of the dundee will actually improve as the size drops to your ideal of 40 wide.. so the 40 should feel (to you) a lot better than the 42 does. If you like the 42, you'll like the 40 more...