Corner patches

Set the reinforcement at each sail corner. The preview and DXF use three proportional layers.

Before you start

Open a design in the 3-D workspace, choose Skin > Fine grid, then choose Panels > Patches.

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The 3-D preview shows every reinforcement layer and keeps panel seams behind the patches.

1. 1 Per-corner radius and aspect ratio
2. 2 Layered patch preview

Shape each corner outline

The dialog has one row for Tack, Head, and Clew.

Control	Current range and effect
radius	At least 50 mm. It sets the outer patch's larger sizing radius.
AR	At least 1.0. The smaller sizing radius is the main radius divided by this value; 1.0 gives equal sizing radii.
↺	Resets that corner's aspect ratio to 1.0.

A fresh design sets the sizing radii to 10% of the two supported sail-edge lengths. The software measures the actual 3-D surface edges, sets radius from the longer edge, and sets AR to the ratio of the edge lengths. Tack and clew use their adjacent edges; the head uses the luff and leech.

Head patches start at the luff–head vertex. Their curved outlines follow distances across the sail surface and meet the head when it is long enough, or continue to the leech on a short head. The physical head length does not set the patch size.

These values are defaults, not constraints. They are applied once when you create a design; later manual edits, saved values, and opened designs are left unchanged.

1. Set the tack, head, and clew radii

   Change one radius at a time and watch the corresponding patch layers move on the 3-D sail.

   Checkpoint

   The layered patch updates without generating panels or contacting the backend.

2. Adjust the aspect ratios

   Increase AR to reduce the smaller sizing radius while retaining the entered main radius. Use ↺ when you want equal sizing radii.

3. Keep the changes

   Select Done. Patch values are included when you save the design.

Preview and exported layers

The 3-D workspace and Corner Patches DXF use the same three layers per corner, at fixed percentages of the configured radius:

1. the entered radius at 100%;
2. a middle layer at 75%; and
3. an inner layer at 50%.

The preview draws each layer as neutral grey reinforcement cloth at 30% opacity. Overlapping layers naturally appear darker. Panel seams stop visually at the outer patch instead of showing through it; the underlying sail and its boundary remain visible.

Patch layers have no panel seam neighbours and receive no seam allowance. The Corner Patches DXF guide covers the file, sign-in requirement, and rendered checks. Unlike the panel exports, this action does not require Generate Panels first.

Continue the panel workflow

Build the panelsChoose a layout → Configure the seam network independently of the reinforcement outlines. Build the panelsBattens → Place batten pockets and configure their reinforcement and cut pieces. Build the panelsReefs → Set reef tack and clew positions and their separate reinforcement. Build the panelsGenerate and inspect panels → Flatten the selected panel layout and review its generated cut geometry.