Sailcut CAD

Sailcut CAD is an open-source, specialized computer-aided design (CAD) and plotting software used to design boat sails and calculate flat-panel templates for manufacturing. Originally created by Robert Lainé in 1978 and later modernized as an open-source project by Jérémy Lainé, it serves a diverse community ranging from professional sailmakers to amateur DIY builders and model yacht enthusiasts. 🛠️ Core Features

3D Design & Aerodynamic Profile: The software uses a unique mathematical definition of the sail’s surface to ensure a smooth, aerodynamically optimal profile. It supports 3-sided sails (like Marconi mainsails or jibs) and 4-sided sails (such as gaff rigs).

Flat Panel Development: Sailcut CAD automatically calculates how the 3D surface translates into 2D, flat fabric panels. It factors in seam and hem allowances so users can cut cloth perfectly to form the desired 3D shape when sewn together.

Visualization Tools: Built using OpenGL, it allows users to view and rotate the sail in a wireframe or shaded 3D preview to inspect the design before manufacturing. 💻 Compatibility and Technical Specs

Cross-Platform Support: The application is written in C++ using the Qt graphical interface framework. Officially compiled executables and source code are available for Windows, macOS, and GNU/Linux platforms.

Exporting Capabilities: To move from design to cutting, the program exports to standard DXF (AutoCAD) files, plain text, and specialized Carlson plotter formats. This allows users to feed files directly into CNC fabric plotters.

Multi-language Support: The interface can be toggled into several languages, including English, French, German, Italian, and Portuguese. ⚠️ Limitations to Consider

Rigging Specifics: The software expects traditional sail profiles where the luff is attached to a rigid or semi-rigid mast/forestay. Users designing highly complex “flying sails” (like free-floating spinnakers) often report difficulty getting the program to bend the curves correctly.

Material Mechanics: While it calculates the physical shapes, it is up to the user to manually account for fabric stretch, cloth weight, and wind load tuning depending on the sail material chosen (e.g., Dacron, Polytarp, or Mylar).

You can download the program and view detailed documentation directly on the Official Sailcut CAD Website. If you are planning to build your own sail, tell me: What type of boat or rig are you designing for? Do you plan to cut the panels by hand or use a CNC plotter?

I can guide you on the specific parameter inputs you will need to prepare! Sailcut CAD | Sailcut