Wavefoil provides retractable bow foils that reduce fuel consumption and ship motions in waves. Fuel saving for suitable ships is typically in the range of 5-15%, while ship motions typically are reduced by 10-25%. A vessel operating in waves experiences increased resistance and decreased propulsion efficiency. This is effectively counteracted by the foils. In addition, the foils generate a thrust force due to the nature of an oscillating foil at forward speed – exploiting the same hydrodynamic principles as a swimming whale.