Spin-up rate (top panel), jet (red plus signs), wind (blue diamonds), and total (black) efficiencies (bottom panel) as a function of the MBH spin for the MCAD solution applied to the radio mode. The symbols represent the results from the simulations of McKinney et al. (2012) and the solid lines indicate the interpolated functions used in the NEWHORIZON simulation. As opposed to the thin disc solution (Fig. 3), gas accreted from the thick accretion disc always decreases the MBH spin. The MCAD feedback efficiency is an increasing function of the absolute value of the BH spin with a minimum efficiency for non-rotating MBHs.