the patent describes a method for generating a net linear force with a rotational machine forced into imbalance utilizing a fluid mass . the fluid mass is added to , and rejected from the rotor to load one half of the rotation with more mass than the other half , thereby causing a net reaction force in the direction of the loaded half of the rotation . this patent is intended specifically to cover the method of utilizing a fluid motive mass for a rotational imbalance in a force generating machine .