“…Since in the transient test, ω is not defined, an equivalent quantity would be the tip speed ratio, r U / , where ṙis the displacement speed of the section. As demonstrated by Laneville and Dallaire (2006), the tip speed ratio is an important quantity regarding aeroelastic phenomenon and brings good correlation between experimental observations. Therefore, the choice of the tip speed ratio as a dimensionless group seems to be an acceptable alternative to the reduced frequency for the present experimental context.…”