Step 1: Performance prediction
Based on the type and dimension of wind propulsors, the forces are estimated as function of wind speed and angle. The wind propulsion settings (trim, reefing, rotation rate, etc.) are optimised for each wind condition. , accounting also for any power required for active devices such as Flettner rotors and suction sails. Constraints, e.g. on heel, are included. The change in efficiency of the conventional propulsion and the resistance of the ship on account of leeway are included as necessary, depending on the proportion of wind assistance. The result is a full Performance Prediction Program (PPP), describing the remaining propeller thrust, power, fuel consumption and CO2 emissions as function of wind angle and speed.
Step 2: Wind statistics
Wind statistics are gathered for the relevant route(s) either from existing databases or from measurements delivered by the client.
Step 3: Overall performance
Getting the overall performance is a matter of multiplying the performance matrix from the PPP with the wind statistics matrix. The result is the average fuel and emission performance, which is be split out per ship, wind propulsion configuration, route and speed. The results are uploaded to a private space on BlueRoute, allowing you to interactively assess apparent wind and performance on arbitrary routes and alternative speeds.