HydroComp, a provider of hydrodynamic analysis software and services in propulsion prediction and propeller design has added two new features to its vessel speed analysis platform, NavCad.
NavCad predicts and analyses vessel speed and power performance and can be used to help select suitable propulsion system components, such as engines, gears and propellers onboard vessels. The two new features added to the software include a ‘progressive pitch’ and a new model for surface-piercing propellers (SPPs).
A progressive pitch propeller has a cambered propeller face, which changes the thrust and torque loading characteristics of a propeller. HydroComp says that the progressive pitch will particularly benefit those evaluating outboard and stern-drive propellers, as well as contemporary propellers for high speed craft.
The new SPP model offers NavCad users with a model for a 5-bladed cleaver-style wedge-sectioned propeller. HydroComp has carried out in-house research to develop a new performance metric for a “minimum critical speed”, below which SPP propeller performance begins to fall off. This new design criteria can provide information to ensure that the Vessel-Propulsor-Drive system running SPPs have the proper gear ratio for the proposed speed and power.
HydroComp’s Analytical Distributed Volume Method (ADVM) method has undergone additional updates to expand its scope to fuller vessels (such as workboats and full form merchant vessels) and further improve its prediction accuracy. It also has a better predictor of the longitudinal contribution of a design’s sectional area curve and beam distribution on wave-making resistance. This provides a better tool for optimisation of hull geometry where it is most effective and has the least demand on computational resources.