i've seen a surfboard like this on the internet several times and thought i'd give it a try :) this time in affinity
we create a swirls with the finished tool
I have taken a very thick contour
we then adjust that
set the windings
the different thicknesses are obtained with the width tool
the inner anchor point is very narrow and the outer anchor point is so wide that the edges do not overlap
the board is created from a rectangle
here i have added the anchor points in the center
top and bottom
then I just moved the existing ones
it is a multiple adjustment of the anchor points and curves
Here you can get creative
customize the swirls
mirror and resize
I have created an extra contour for some of them
and subtracted this contour from the border
paint the backside
glue both sides together