A high resolution compressible LES of the flow past a small-scale two-bladed rotor has been carried out. The latter operates under hovering conditions at 6000 rotations per minute (rpm), i.e. in the low Reynolds and Mach number regime (Re_Tip ~125 000 and M_tip ~ 0:23, respectively). Complex 3D structures are revealed that take different forms along the span, from attached flow inboard to separated shear layer outboard, with induced two-dimensional and/or three-dimensional structures that advect over the trailing edge. These structures lead to different noise radiations, both tonal and broadband, which are numercially resolved in the near field. Correlations between near field noise and structure footprints at the blade surface are analyzed using SPOD, providing insights into typical noise sources on rotors at low Reynolds numbers