A thickness distribution of about 30 to 33 % in combination with a proportionate thickness will permit an excellent upwind performance. If the thickness/chord ratio is not too high the all-round properties will be extremely good.
If a special emphasis is placed on speed, the maximum thickness of the fin can be pushed further to the rear, even up to 50 % or more. This type of profile is called laminar profile as the transition of laminar flow to turbulent flow is delayed. For this purpose a very small nose radius is necessary which on the other hand reduces the possible lift. Therefore, a laminar profile is good for speed fins with a reduced upwind performance.