Mercury - Complete Alpha One Gen II Sterndrive Alpha Series Tri-Paint Corrosion-Resistant Finish 51100008P. Overview. There are certain parts on a boat you learn to trust almost instinctively, and a sterndrive is one of them. When it is built right, you feel the difference every time you ease out of the slip, trim up onto plane or settle into a long cruise along open water. The Quicksilver Alpha One Gen II Sterndrive with a 1.47 gear ratio brings that steady confidence back into your boat-no hes