Left panel: Kinetic power of the CIV outflow component as a function of L_Bol for the WISSH QSOs (red and blue stars) compared with WISSH NLR ionized outflows from Paper I (green diamonds) and other samples from literature, (e.g., Fiore et al. 2017 for details; purple triangles). The error bar (bottom right corner) is calculated as described in Sect. 4.3.2. Right panel: Wind momentum load as a function of the outflow velocity. The BLR winds traced by the CIV outflow components from the WISSH QSOs (red and blue stars) are compared with X-ray winds (magenta crosses) and ionized winds (green triangle). X-ray winds for Markarian 231 and IRASF11119+13257 are represented with a magenta diamond and circle, respectively.