It has been discussed earlier that when a body slides down an inclined plane with angle of inclination less than 45° the downward and forward motion of the body can be restricied by a thread or support perfectly parallel to the horizontal so that a portion of the weight of the body is not supported even at the position of rest and sinks down in the same relative space with compression of spacetime in front of it. The minute unidirectional force is magnified when placed at the end of a long rectangular bar perfectly parallel to the direction of gravity on axis of rotation x on universal joint u held by human assisted active balance at the lower end . The rotating lever rod L1 aquires inertia of motion and transmits momentum tangentially to rod L2 that moves up and down to repeat the cycle of momentum transmission. Multiple of such rotating rods can be used to propel a spacecraft under emergency situation. Likewise the centrifugal force generated by machine motion can be used to transfer cyclic pulses of inertia of motion to rod L3 perpendicular to the plane of rotation.