How do I know when to change my fin down or up?
More wind, smaller fin and smaller sail.
Less wind, bigger sail and bigger fin.
Sail size and fin size go very well together.
You need lift to be able to start planing. If you have 15knots of wind and you are out on your 120ltr board and a 7.5sail and a 30cm fin, you could have some problems early planing. and control. The fin is too small. You will push with your back foot…the wind will hit the sail, it seems you are going to plane….but oppps…here the SPIN OUT comes. The fin is too small and cannot handle the sail power and our back foot pressure. This is a common problem.
