Designers took the successful Rocket template as starting point and looked to use over 38º rake whilst still maintaining performance. Their gut feeling was that the super stiff material would work exceptionally well for the weed fin, giving just enough flex to slip through the water with minimum drag but also enough stiffness to be direct and lively underfoot despite the reduced lift.

K4 team developed the prototypes with the help of Steffi Wahl and her friends who sail in the Baltic sea and success came pretty easily!

Some size choice advice from Steffi Wahl:

"In my opinion you should use the same sizes up to 16-17. So 1:1 up to that size. If usually sailing with 18-19 or bigger I would recommend 1 to 2 cm shorter. I think with bigger sizes you get so much fin behind the strap because of the rake…"