2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/229750We make remarks on Ristroph and Zhang's [{\it Phys. Rev. Lett.} {\bf 101}, 194502 (2008)] paper. We argue especially that due to the interferences the calibration procedures in [1] were not complete and this will induce some measurements' error.Submitted to Phys. Rev. Lett. around 2009-MarchOther Condensed Mattertext