DE10233114A1 - Rectangular sail rig for windsurfer has free edges and is slung between two masts in a fixed angle via a support beam and fitted to a standard power joint - Google Patents

Abstract

A rectangular sail rig for a windsurfer is slung between two masts set into a V-shape and with one mast secured to the other near to a standard power joint coupling into the board. The V-shape is fixed by a support beam clamped to the two masts and with extended ends to secure the bottom sheets of the sail. A one sided boom is set between the masts above the support beam. The four sides of the sail are free and the top corners of the sail are secured to the masts by short lines.

Description

That in its beds completely "flying" and in vertical Formed windsurfing rectangle sails made of all conceivable sailing materials is only fixed or trimmed in its 4 sailing corners Help of his windsurf triangle rig, see drawing.

The two symmetrical, so the same length Rig struts (angle struts, kevlar / carbon rods) form one on the sail foot Vertex angle with an angular opening of about 45 degrees. Together they form an isosceles, above open triangle, like the shape of the letter "v".

Approximately in the middle is the one-sided Tree with 2 claws attached according to today's standard windsurfing technique.

The bottom third is horizontal in length of the footbed a cross strut is connected to the two angle struts.

At the apex (at the foot of the rig) the two struts are joined together. Stuck there in a strut the standard windsurf power joint as a connection to the surfboard.

The sail is with its lower (foot) corners at the end parts of the foot strut as well as with the upper corner corners on the end parts of the angle braces trimmed and fixed, see drawing.

For the sail can be 2-ounce spinnaker polyester, monofilm, kevlar, Mylar, Spectra film, but also scaffolding curtain grid film (for DIY) are used, i.e. all modern sail film material.

The new sail can be so complex with today's windsurfing standard sail material, but also entirely simply built in-house without this high-tech material become.

Since the sail, aerodynamically speaking, two laminar symmetrical outflow vortex can flow along the edges of the sail upwards out of the sail, such as with the triangular sail of the main registration, also with the windsurf rectangular sail achieved at least 90 percent more sail propulsion compared to an equal size old surf mainsail, see Marchaj, The aerodynamics of the sails, 1997, Delius-Klasing Verlag, Bielefeld, page 176.

The windsurf rectangle sail can thus by about 50 percent sail area be reduced, comparable to an old "surf mainsail", making it even smaller in scope fails as an equal-sized triangular sail.

Improvement:

The windsurf rectangle sail works with the same aerodynamics (air trailing edge sail) as the object the main filing.

The improvement of the windsurf rectangle sail across from the windsurfing triangle sail of the main application is the lower one Surface extension or the smaller sail circumference of the rectangle compared to the Triangle. So the rectangle is smaller than the triangle. This will sail handling through the windsurf rectangle sail improved.

The pressure build-up of the rectangular sail with its overall free-flying beds is larger than that of a triangular sail of the same size, its air flow on the beds is disturbed by the pole pockets for the rig attachment.

The new triangular with foot brace allows that all Lying the rectangle sail undisturbed and laminar flow from the air and the rectangle sail is still very firm from the 4 sailing corners can be trimmed and fixed.

The new triangular with foot brace can for everyone desired Sail sizes of Windsurfers unchanged to be kept.

Through the one-sided tree the airflow on the back of the sail not bothered. Since the sail does not have to be shifted, only a one-sided tree is required.

With the help of the sailing rig strut the surfer rig and sail can be very convenient and easy out of the water catch up. The exhausting Catching up with start sheets is a thing of the past.

Of course the rectangle sail needs also no longer be shifted, an incredible one for the windsurfer Facilitation of practice, through which everyone can now windsurf.

An important improvement for the "free-flying windsurf rectangle sail" results for the surfer from the almost free in-house production from all sailing materials, like scaffolding curtain grid film or from packing films, because the sail is most effective due to the incoming and outgoing air Profile educates itself.

Claims (4)

Rectangular windsurf sail that is driven vertically. Rectangular windsurf sail according to claim 1) with all beds flies freely in the air. Rectangular windsurf sail according to claim 1) and 2) with a Triangular windsurfing with a foot brace. Rectangular windsurf sail according to claim 1), 2), 3) with a one-sided tree is driven.