DE102009022661A1 - Windsurfing board, has detachable flat elements for changing dimensions of wetted sliding surface of board and hydrodynamic bottom shape of board, where sliding metal pipe is inserted together with tension spring in outer tube - Google Patents

Abstract

The board (1) has detachable flat elements (8) for changing dimensions of a wetted sliding surface of the board and hydrodynamic bottom shape of the board. The flat elements are individually or entirely lifted up from the wetted sliding surface of the board by a telescope system during sailing. The flat elements are connected with a screwed front part of an inner tube of the telescope system and a link joint. A sliding metal pipe is inserted together with a tension spring in an outer tube, where the tension spring is mounted at an end of the outer tube.

Description

To known prior art in the construction of windsurfing boards has the Underwater hull a constant, hydrodynamically shaped shape and area size. Thereby turns into a stationary speed state after starting the board, resulting from the balance between the propulsive force of the Sail and the hydrodynamically acting resistance of the board.

at the own invention leaves itself with a device integrated in the board (by the surfer by foot pressure or manually triggered) the wetted area of the hull and its hydrodynamic shape during the Change drive.

• a) Beim Segeln mit der maximalen Gleitfläche wird ein frühes Angleiten des Boards und das Surfen bei geringer Windstärke ermöglicht.
• b) Bei größerer Windstärke kann durch Fußdruck-Auslösung der Vorrichtung, die benetzte Gleitfläche des Boardrumpfes in 2 Stufen wirkungsvoll verkleinert und gleichzeitig seine hydrodynamische Form verändert und dabei der Wasserwiderstand des Unterwasserschiffes effektiv reduziert werden. Das Resultat ist ein Rückgang der Haltekräfte für den Surfer und ein deutlicher Anstieg der Segelgeschwindigkeit bis zum neuen Gleichgewichtszustand zwischen aerodynamischer Vortriebskraft und hydrodynamischer Widerstandskraft
• c) Der Einsatzbereich für das Surboard wird durch die Erfindung erheblich gesteigert und erlaubt in den meisten Revieren den Verzicht auf die Mitnahme von zwei Boards, eines Leichtwind-Boards sowie eines weiteren sogenannten Starkwind-Boards mit kleiner benetzter Rumpfgleitfläche.
• d) Die eigene Erfindung mit einem Teleskopsystem, aus der benetzten Gleitfläche eines Boards Flächenelemente hochzuklappen, ist bei der Herstellung von Surf- und Windsurfboards universell anwendbar.

It results with the invention new opportunities to drive a windsurfboard or surfboard optimally .:.

• a) When sailing with the maximum gliding surface, it is possible to plan the board early and surf at low wind speeds.
• b) For larger wind force can be effectively reduced by foot pressure triggering the device, the wetted sliding surface of the board body in 2 stages and at the same time changes its hydrodynamic shape and thereby the water resistance of the underwater vessel can be effectively reduced. The result is a decrease in surfer retention and a significant increase in sail speed to the new equilibrium state between aerodynamic propulsion and hydrodynamic drag
• c) The area of use for the surboard is considerably increased by the invention and allows in most areas to waive the entrainment of two boards, a light wind board and another so-called strong wind board with small wetted fuselage sliding surface.
• d) The invention with a telescope system to fold up the wetted sliding surface of a board surface elements, is universally applicable in the production of surfing and windsurfing.

massgebend.As a useful factor of the system, the ratio is:

authoritative.

overall depth and geometric shape of the floor elements can after fluid mechanics Be determined. The determination of the shape can be made in Connection with the chosen one Design for that Rear and the choice of surfers preferred driving characteristics for their Surfboard, optimally designed.

Mechanical flow conditionally has z. B. a board with deep, guided to the tail edge, sharp-edged Rails prominent driving characteristics on steep "upwind sailing courses".

For fast "spaceship courses" is against a geometric shape of the surface elements, the one shortened Rail execution of the board, for maximum speeds at an advantage.

Two from a variety of possible geometric surface element shapes, are in the attached pictorial Representation "GROUND DES BOARDS ".

Ausführbarkeits study:

(Photos of the execution were requested from the Study removed)

At a cut-off hull of a surfboard was the feasibility examined. The result is positive.

in the Detail was in the practical execution of the bottom of the fuselage a surface element cut out and the exposed polystyrene foam of the surface part laminated with glass fabric and epoxy resin waterproof and smoothed. In the outer tube was a good sliding metal tube with a spring suspended at the tube end F1 used.

By Lifting the locking pin from the hole in the metal inner tube becomes (by the tensile force of the spring F1) the metal tube with the thereto attached surface element pulled out to the rear from the fuselage to the stop.

One Metal joint between metal tube end and the element arranged, (As well as a spring F2) let the surface element fold upwards.

The Re-entry of the surface element in the hull bottom can from the surfer about a simple traction device, by automatic Tilting down the surface part in the horizontal axis direction and subsequent engagement in the hull, executed become.

at This process, the tension spring F1 is stretched again and the locking pin engages after reaching the end position.

Of the Bottom of the surfboard hull again has its full sliding surface and the hydrodynamically shaped initial bottom shape.

For the practical Use is the execution the board with two parallel, hinged surface elements planned.

1

Windsurfboard in isometric view with two folded surface elements ( 8th ), Mast track ( 2 ), Masstfuss ( 3 ), Adjustment knob ( 4 ), Footstrap ( 5 ), Fin screw ( 6 ), Fork joint of the telescope system ( 7 ).

2

Windsurfboard in isometric view with two integrated in the sliding floor (retracted) surface elements ( 8th ), Gutter for the Zugtampen ( 9 ), Stop for the rope end ring ( 10 ), Trigger or locking pin ( 11 ).

3

Schematic representation of the telescope system ( 12 ) for the size change of the wetted bottom surface and the hydrodynamic hull and stern form of surfboards, during sailing, rope with Einhängering ( 13 ).

4

Surface element ( 8th ) with screwed front part of the telescopic inner tube and fork joint ( 7 ) in the top and side views as well as with section XY.

Dimensions of the surface element:

• a = 457 mm,
• b = 200 mm,
• c = 391 mm,
• d = 50 mm,
• e = 35 mm,
• f = 43 mm,
• g = 17 mm.

5

Front part of the telescopic inner tube with fork joint ( 7 ), shown in the top and side view and with detail "Z".

6

Telescoping outer tube and the end portion of the telescopic inner tube in the top and side views as well as with section A-B.

1

surfboard with fold-up surface elements

2

mast track

3

Mastfuss

4

Adjustment

5

Fusschlaufe

6

Finnenschraube

7

yoke of the telescope system

8th

Tiltable surface element

9

Rope-groove

10

attack for Tampenring

11

release button or locking pin

12

telescope system

13

Tampen with hanging ring

Claims (2)

Windsurfboard and Surfboard ( 1 ), characterized in that the board with removable surface elements ( 8th ) is carried out to change the size of the wetted sliding surface and its hydrodynamic bottom shape. Windsurfboard and Surfboard ( 1 ) according to claim 1, characterized in that during sailing, by foot button operation ( 11 ), via a telescope system ( 12 ) Surface elements ( 8th ), individually or together, are moved out of the sliding surface of the board and folded up.