Pi Zero could be underpowered but the bigger pi’s sound like a perfect match. I would recommend looking into a used pi 3 or 4, because the pi 5 is new and always out of stock (at least in europe) so you pay around 150$.

As I learned in a one week windsurfing course you can get pretty speedy just with the force of wind, but you can also smack your head pretty good if the sail is not alligned propally.