PURPOSE: To prevent any influence on the environment without limiting an installation site for a power engine by providing a weight in a radius changing freely and furnishing a guide to guide this radius changing freely.

CONSTITUTION: Radi Y1, Y3 changing freely are provided, and weights N., N, are provided on these radi Y1, Y3. Guides M1.S1, M3.S3, B to guide the radi Y1, Y3 changing freely are furnished. The radi Y1, Y3 changing freely and the guides S1.M1, S3.M3 becomes non-balanced and move in specified directions. The other guide B moves in a specified direction. By non-balancing a point of force-a point of application, movement is optionally maintained. In this way, the installation site of a power engine is not limited. Additionally, no influence is affected on the environ.