One2three Naval Architects: Designers of Monohulls, Catamarans and Trimarans


The underwater hull shape of a vessel is influenced by a multitude of factors and One2three invest a lot of time to get this right. Careful weight analyis is the first step and a detailed calculation is carried out for each new design. An extensive database of previous designs is utilised to validate all calculations.


One2three customises the hull shape for each new vessel design to create the most efficient shape possible. We use Maxsurf to analyse buoyancy distribution and influential hull contours, view geometric fairness of a hull shape & generate hydrostatic properties of a hull.


A thorough resistance estimate is performed at the start of a design and continually checked throughout the design spiral. One2three are continually adding to our inhouse tank-test data to create hull forms with the lowest resistance and best seakeeping.

One2three also have in-house computational fluid dynamics (CFD) capabilities. Using our free-trimming Navier-Stokes code, incorporating Volume-of-Fluid (VOF) modeling, both the aerodynamic and hydrodynamic performance of potential designs can be analysed and optimised in a timely and cost effective manner.


At One2three, we pride ourselves on styling a vessel to any customer desires in a manner that is easy to build. One2three uses Rhinoceros to model the superstructure surfaces in 3D. This allows a 2D design to "come to life" with all the important styling details incorporated. Fairing and visualisation of the structure is carried out at this stage before being output for structural detailing.


Concurrent with the other design items, the intact and damaged stability of a vessel is analysed using the industry-leading Hydromax software package. This ensures that the vessel fully meets it's safety requirements and also that come launch day, there are no surprises and the vessel floats exactly on her lines.