The invention of the first duct portion, the driving portion and the vessel is coupled to generate a driving force for the ship to be positioned between the driving portion, the driving portion and the vessel is coupled to the stern of the vessel was in the stern adjusting the flow rate of the fluid moving parts of the promotion to be located between the player coupled to the stern, in the first duct a second duct portion which is spaced apart from the coupling from the unit, and the first duct and the second duct respectively, to and includes a flow rate adjustment for the flow rate control portion of the first duct for the passage portion to increase the flow speed of the fluid moving parts of the pushing so as to project into the first duct portion coupled to the first duct portion acceleration member , and such that the said second duct passing through the projected outside the second duct portion in order to reduce the flow speed of the fluid to move the pushing portion The present invention relates to propulsion devices for ships, it characterized in that it comprises a speed reduction member coupled to the second duct portion.
By controlling the flow rate of fluid distribution to the mobile parts of pushing through the duct sections, each with parts of the flow rate control according to the present invention, since the flow velocity distribution of the passing through the fluid propulsion unit can be made uniform, to improve the propulsion unit operating efficiency is.