FIELD: transportation.
SUBSTANCE: fin blade propulsor for watercrafts of surface and underwater navigation, includes embodiment of the surface vessel, which contains on both sides from the vessel axis line the extended stern fins with the windows, overlapping by blades, while moving toward the axis vessel line. The trim plane is installed on the stern cut of the vessel's bottom with the fins placed on it on their axes, reciprocating mechanisms with movable rods and the control units of the latter. The reciprocating mechanisms rods are connected to the fins by means of the hinges. In the embodiment of the underwater vessel, which contains on both sides from the vessel axis line the extended stern fins with the windows, overlapping by blades, while moving toward the axis vessel line. The trim plane is installed on the stern cut of the vessel's bottom, which is movable and fixed at the axle, and connected to the gear motor, mounted on the bottom of the vessel. The gear motor is connected with the speed reference system and the vessel rotation angles.
EFFECT: increase of the efficiency, elimination of cavitation, removing of the suction effect and electromagnetic interference.