We measure the gravitational recoil for unequal-mass-black-hole-binary mergers , with the larger BH having spin a / m ^ { H } = 0.8 , and the smaller BH non-spinning .
We choose our configurations such that , initially , the spins lie on the orbital plane .
The spin and orbital plane precess significantly , and we find that the out-of plane recoil ( i.e .
the recoil perpendicular to the orbital plane around merger ) varies as \eta ^ { 2 } / ( 1 + q ) , in agreement with our previous prediction , based on the post-Newtonian scaling .