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...Physics of fluids rotational dynamics a superhelix towed in stokes uid sunghwan jung applied mathematics laboratory courant institute mathematical sciences new york university mercer street usa kathleen mareck and department tulane st charles avenue orleans louisiana lisa fauci michael j shelley received june accepted september published online october motivated by the intriguing motility spirochetes helically shaped bacteria that screw through viscous uids due to action internal periplasmic agella we examine fundamental superhelices translating rotating superhelical structure may be thought as helix whose axial centerline is not straight but also particular case which these two superimposed helices have different handedness employ combination experimental analytic computational methods determine velocity bodies being very nd direction rate rotation body result competition between for small amplitude controlled short pitched while there crossover at larger control far better excellent ...