Major contributions to the radiative acceleration for two hydrodynamically consistent, hydrogen-free WN models with T_* = 130 kK, log L/L_⊙ = 5.7, M = 20 M_⊙, and D_∞ = 10 (upper panel) or D_∞ = 50 (lower panel): for the line contributions, all elemental contributions except Fe are summed over all ions. The total radiative acceleration (a_rad), the Thomson acceleration from free electrons (a_Thom = Γ_e · g), and the contribution from gas (and turbulence) pressure (a_press) are also shown for comparison. The loosely dashed horizontal line denotes the total Eddington limit that needs to be overcome to launch a wind.