For if anyone is interested, here the shape of the "new" Serum explained. The bottom shape is a continuing V from front to back combined with a deep double concave which gradually starts from 30cm from the nose, is strongest below the front straps and gradually reduces again to be zero 50mm behind the tail. The V in the front breaks the chop and gives more rocker on the front rail for better turning. The deep double concave channels the water. The deepest point of the concaves is not in the centre but are placed a little closer to the rail which gives more grip in the turn. The deep double concaves do "eat" about 1L of volume, however, since the sizes stay the same, it still feels like a board with 1L more.
As with all Witchcrafts, the volume is placed between the centre and rails to not to have too thick rails nor a too thick middle to prevent it feels like a tree trunk. The centre of bouyancy is located right behind the mastbox. You only need volume when not planing and when you are not planing, the fins don?t work so you need to step forward anyway to not turn into the wind. Also typical for Witchcraft: the rails are very round in the front to guide the water under the board, going sharp towards the back to give more planing area, a clean water release, more reactivity and more grip. And toe-in with pre twisted side fins off course. As you can see, the inserts and rails are also shaped by CNC. The bottom PVC is tapered towards the nose.
