Effect of STEP for Reducing Added Resistance in Waves

The present paper provides the results of an investigation on STEP (Spray Tearing Plate) for reducing the added resistance in waves.The research has been started to develop a device for suppressing spray; thin wave like a film that is generated around the bow above the waterline when a ship runs in waves. The effect of STEP is examined through tank tests with a model of 2500TEU container ship equipped with bolsters for anchors. The optimum shape of STEP reduces the added resistance in waves by 10% at designed speed under the condition of summer full load in short head waves of 3 meter height. The 3% reduction of CO2 emission is indicated by the tank test results and calculation for ship performance in head waves and winds of Beaufort scale 6.