NOVELTY - Input gear (24) and output gear (74) are respectively mounted on system input shaft (14) and system output shaft (76), which are offset from central axis. The output gear is engaged with forward peripheral gear portion of output power disc (70) located in the periphery of the rim of the output power disc. Power change results between the system input and output shafts in operation of the mechanical power system (10).    USE - For generating electric power used to run large number of machines or systems, such as electric powered vehicle and irrigation system, which vary in output capability, and for powering electric lights and electric appliances.    ADVANTAGE - Inexpensive and economical by supplying power at output in response to input source and by producing power change between input and outputs. Eliminates drag when system is up to speed. Start-up of system is more efficient and takes less time. Improves power efficiency.    DETAILED DESCRIPTION - An input power disc (26) includes a first peripheral disc portion in the periphery of the rear rim (32) of the input power disc for mating with the input gear, and a second peripheral gear portion in the periphery of the front rim of the input power disc. The output power disc has outer gear members rotatably mounted to the rear surface of the output power disc and positioned to mate with the second peripheral gear portion of the input power disc. The second peripheral gear portion of the input power disc has a diameter less than the outside diameter of the input power disc. A central gear (64) is mounted to be fixed relative to the central axis and further mounted to mate with outer drive gears on the output power disc, such that rotation of the input gear results in the rotation of the input and output power discs about the central axis.    DESCRIPTION OF DRAWING(S) - The figure is the exploded perspective view of the mechanical power system.    Mechanical power system (10)    System input shaft (14)    Input gear (24)    Input power disc (26)    Rear rim (32)    Central gear (64)    Output power disc (70)    Output gear (74)    System output shaft (76)