Tubercle porpoise fins - bonzer EVO4

Today I finally finished foiling my new tubercle fins for the 6'0" demo porpoise bonzer EVO4. The panel was a lay-up of 4 x 6oz translucent blue + 6mm aircraft grade birch 12 ply + 4 x 6oz in translucent blue. Really stoked with how they have come out and it will be interesting to see if the fins have the same hydrodynamic energy conversion characteristics that have been found on wind-turbine blades. The design is of course based on nature, coming strait from scientific research into the hump back whale after scientists struggled to understand how the whales could manouvre so tightly at low speeds as they blew their bubble curtains to contain the plankton.