jSDN is a NURBS based yacht modelling and analysis software. It is based on SDN, but it has been redesigned with many new functionalities and much more accurate calculations, which are being validated with real designs. Although SDN was programmed in C, jSDN has been developed using the Java language, so that it can be run on many operating systems (it has been tested on Apple OS X, Linux and Windows XP/Vista).

The main goal of jSDN is allowing the designer to fast prototype any kind of sailing yacht, including elements like hull, spars, sails and appendages. Although it is not limited to sailing vessels, both the working procedure and tools are targeted and optimised for those.

The jSDN software is distributed as a single download per operating system, which is fully functional. By default, jSDN is run in FREE mode, which implies that a few of the functionalities are not activated, except for design files saved with a PRO mode license (signed designs). In order to run jSDN in PRO mode, a valid license file must be purchased and provided. A free PRO evaluation license can also be obtained, which is fully functional and expires in 15 days. We are working to enable a secure web server for license payment (VISA, MasterCard, etc). Meanwhile you may send evaluation license requests, inquiries and quotation requests to: jsdn-info@ingeniatecno.com. The following table summarises the functionalities of the different licensing options:

  FREE PRO
Full NURBS curve and surface editor
ok
ok
Basic POLY editor
ok
ok
Importing 3DS, AC3D, STL, DXF and VRML files
ok
ok
Importing IGES and IMS files
ok
Exporting IGES files
ok
Automatic sail measurement (RN and IMS)
ok
ok
Automatic weight calculation and load management
ok
Hydrostatics calculations
ok
ok
Transversal stability calculations
ok
ok
Longitudinal stability calculations
ok
Automatic trim calculation for stability
ok
Automatic CoG calculation for stability
ok
Velocity prediction calculations
ko