2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/108333The dynamics of a rotating elastic filament is investigated using Stokesian simulations. The filament, straight and tilted with respect to its rotation axis for small driving torques, undergoes at a critical torque a strongly discontinuous shape bifurcation to a helical state. It induces a substantial forward propulsion whatever the sense of rotation: a nanomechanical force-rectification device is established.4 pages, 3 figures, to be published in Physical Review LettersSoft Condensed MatterMaterials Sciencetext