Floating hydrodynamic fin system

Abstract

Floating hydrodynamic fin system, useful for surfboard and windsurf, modifying its fin lift trim by a calibrate and controlled spring and an asymmetric shape of the fin-base that leaves a gap between said fin-base and the fin-box, allows the floating of the system rearward and/or forward. This happens by: 1) reducing the resistance of the water flow against the fin. 2) influencing the critical point of the board by the vector lift force displacement rearward in one or more critical times. 3) reducing the fin lift surface due to a part displacement of the fin into the fin-box. Said system can also works by a limited and calibrated movement of a fin-box into another fin-box controlled by a spring calibrate device and by a suitable fin-box shape that leaves a gap between the inside and outside box allowing the floating of the system.

1 ) Floating Hydrodynamic Fin System useful for surf and windsurf is characterized by:
 A fin box located near the rear of the surfboard,   A fin located within the fin box,   A spring device located in the rear between the fin and the fin box and composed of the following parts: a steering and calibrated spring located in a screw that hooks the fin to the board by its head and by a blind nut to the fin box,   Said Spring device appositely built in order to compress the spring itself when the speed causes a certain amount of resistance in the water, When, the pressure on the fin is reduced, the fin returns to its original position relaxing the spring,   A plurality of motions of the fin rearward and forward for enhancing early planning, maintenance of planning for more time and distance and maneuverability of the board.   
   
   
       2 ) Floating Hydrodynamic Fin System as claimed in  claim 1 ) is further characterized by:
 The timing of the fin lift displacement: When the hoard overtakes the critical speed, starting to plane, and it is getting ready for the maneuvers, the system lets move the fin lift trim for enhancing early planning and easier, maneuverability of the board.   
   
   
       3 ) Floating Hydrodynamic Fin System as claimed in  claim 1 ) is further characterized by:
 A fin box into another fin box controlled by one or more calibrate springs and by a suitable fin box shape which leaves a space between the inside and outside box allowing a limited and calibrated movement of the fin system, Said limited and controlled motion both rearward and forward happens simultaneously and automatically while changing the fluid resistance depending on the planning phases and maneuvers of the board.