Abstract: An example wind turbine is provided that includes a shaft assembly, strut mounts coupled to the shaft assembly, airfoils directly or indirectly coupled to the strut mounts, and a generator assembly connected to the shaft assembly. The shaft assembly defines a central longitudinal axis of the wind turbine. The airfoils are capable of being positioned in a fully extended orientation and a fully retracted orientation. Rotation of the airfoils results in rotation of at least a portion of the shaft assembly to generate electrical current with the generator assembly.

Abstract: Exemplary embodiments are directed to a heat engine. The heat engine includes a pipe that defines a continuous internal path. The pipe includes a first pipe section and a second pipe section. The heat engine includes a first piston disposed within the first pipe section. The heat engine includes a second piston disposed within the second pipe section. The first and second pistons are magnetically linked to travel along the continuous internal path of the pipe.

Abstract: Exemplary embodiments are directed to a heat engine. The heat engine includes a pipe that defines a continuous internal path. The pipe includes a first pipe section and a second pipe section. The heat engine includes a first piston disposed within the first pipe section. The heat engine includes a second piston disposed within the second pipe section. The first and second pistons are magnetically linked to travel along the continuous internal path of the pipe.