Submerged fin for wave energy conversion

An energy conversion system comprising:

• a platform anchored to a sea floor;
• at least one column disposed on the platform;
• a power takeoff system connected to the at least one column, wherein the power takeoff system includes a first arm including a piston-cylinder assembly, and wherein the first arm is coupled to a first joint;
• a fin connected to the power takeoff system, wherein the fin is submerged below a surface of the sea;
• and
• a second arm coupled to a second joint, wherein the first and second arms are coupled together at a third joint,
• wherein the fin is coupled to the first and second arms adjacent the third joint,
• wherein the fin is configured to use subsurface wave motions to extract energy via the power takeoff system,
• wherein the piston-cylinder assembly includes a piston configured to move in an axial motion in a cylinder in response to the subsurface wave motions against the fin, and
• wherein the first and second arms rotate about the first, second, and third joints as the fin drives the piston to move in the axial motion in the cylinder in response to the subsurface wave motions against the fin.