A mechanical force generator for producing a unidirectional force by converting rotational force energy to a directional force by rotating a plurality of force generating units within a housing. Each force generating unit has a plurality of eccentrics mounted within an elongated structure. The eccentrics rotate around a shaft mounted transversely to the centerline of the elongated structure, and the structure rotates around its centerline, powered by a rotational force supplied to the housing. The rotation of the eccentrics produce a resultant unidirectional force.