Consider a solution with right-handed screws (R) and left-handed screws (S) rotating in the y-axis under a constant revolution frequency. Since the screws are rigid bodies, their vorticity in the y-axis (ω y ) is twice their revolution frequency. In this solution, there will be competition caused by perpendicular displacement of the screws: the R screws will begin to move and pull their surroundings in the positive y-direction, while the S screws will pull in the negative y-direction.