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10/08/09 - USPTO Class 441 |  1 views | #20090253319 | Prev - Next | About this Page  441 rss/xml feed  monitor keywords

Floating hydrodynamic fin system

USPTO Application #: 20090253319
Title: Floating hydrodynamic fin system
Abstract: 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. 3) reducing the fin lift surface due to a part displacement of the fin into the fin-box. 2) influencing the critical point of the board by the vector lift force displacement rearward in one or more critical times. 1) reducing the resistance of the water flow against the fin. 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: (end of abstract)



Agent: Massimo Ferru - Rome, IT
Inventors: Massimo Ferru, Massimo Ferru
USPTO Applicaton #: 20090253319 - Class: 441 79 (USPTO)

Floating hydrodynamic fin system description/claims


The Patent Description & Claims data below is from USPTO Patent Application 20090253319, Floating hydrodynamic fin system.

Brief Patent Description - Full Patent Description - Patent Application Claims
  monitor keywords FIELD OF INVENTION

This invention is related to water planning crafts, such as surf and windsurf, and the function of the fin lift to enhance planning, maneuverability and specific tacks.

BACKGROUND ART

Fins are generally described by different shapes and hardness and are made of several lengths, width and twist response: it may change relative to the size board, sea and wind conditions, specific requirements. Fins available in the market typically are done to be located into a fin-box in a fixed position and the fin lift trim typically carries on its function by the fin in a static position near the rear of the board, so the desire to enhance such function is an objective of surfboard and fin constructors. In the present invention the fin can float in a limited calibrate oscillation.

DETAILED DESCRIPTION OF THE INVENTION

The present invention discloses “floating hydrodynamic fin system” for windsurf and surf. The fin systems available in the market don\'t float because the fin is stopped in a fixed beforehand position under the board, near its rear.

In the present invention the fin can float in a limited calibrate oscillation toward the rear-board. This fin floating is due:

    • a) to a particular spring calibrate device or any other device that achieves the same function;
    • b) to an asymmetric shape of the base of the fin which leaves a gap between the fin-base and the fin-box.

The spring is calibrated to let float the fin when the board is starting in a manner to reduce the resistance of the water flow against the fin and to displace said fin in a better hydrodynamic position.

Such device is adjusted by one or more springs in a manner to leave when the force generated by the water flow is pushing.

Said spring is located in the screw that locks the fin to the board by its head, and by a nut and lock nut (or blind nut) into the fin-box, at the same time the screw allows the movement of the fin and the spring, after compression, will relax floating in hydrodynamic mode.

The spring setting of the floating Fin system is done in accordance with the different kind of windsurf, surf, sea and wind conditions, or/and specific requirements.

The floating fin system changes the lift trim by a displacement toward the rear-board. When the board is jumping out of the water (critical start planning) said displacement carries on its function by the following:

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