The present work is an experimental study of two thin flexible sheets attached to the streamlined support, subjected to low subsonic flow. In the present study, two sheets made of OHP sheet with a constant aspect ratio attached to NACA 0015 aerofoils were studied at low-speed (0–15 m/s) by placing them in a side-by-side configuration. At low wind speeds, the sheets start oscillating at low-amplitude vibrations resulting in a large-amplitude flutter as the wind speed reaches a critical value. The critical Reynolds number depends on the gap between the filaments. Beyond this critical Reynolds number, the sheets are set to have two phases of oscillation, out-of-phase, and in-phase. The flow physics of the oscillating sheets was investigated through hotwire anemometry and particle image velocimetry (PIV).