PURPOSE: To dispense with fuel as well as to make a boat drivable with natural force and suchlike, by constituting it in combining plural numbers and several type of motors such as a gravity motor, a pressre motor, a spring motor, a new type engine, a new type automatic spindle device, a different type Diesel engine, a different type electric motor, etc.

CONSTITUTION: For example, a gravity motor 33 is one being rotated and driven by the force of gravity consisting of dead load, load universal gravitation, etc. And, it is constituted of a pressure motor 4 rotated and driven by plural multilayered bearing devices 17, 19 and fluid pressure, rails 11, a new type automatic metallic chain belt- cum-automatic rail 12, a new type electric motor 13, a small expansion cylinder 14, a small expansion piston 16, these bearing devices 17, 19 and a pressure motor new type rotary vane 42, a pressurizing device 45, etc. Both upper and lower rails 11 possess function of a magnet and a line of magnetic force, and a section being the same type in a power generating method at a hydraulic power plant and equivalent to a windmill is of these rotary bearing devices 17 and 19, a section equivalent to the magnet is of the new type automatic metallic chain belt 12, while these rotary bearing devices 17 and 19 make power generation possible to be done from the said line of magnetic force.