What's a Ring Drive? It's a surface drive turning through a two-speed, V-drive transmission. This shortens the installation, placing the engine above the drive unit and, unlike other surface drives, placing the props right at the transom instead of several feet aft. That's my explanation anyway. Engineers say that the ring in Ring Drive refers to the robust mounting of this innovative system. Each transmission is bolted directly to the surface drive forward. Aft is a shaft bracket that supports the shaft strut and bearing. The engines are bolted directly to their corresponding transmission and shaft bracket. That's the ring: engine, gearbox, shaft bracket. Since the shaft bracket and transmissions are mounted to a tunnel molded into the hull, no extra stringers are needed, which frees up engine space. And because all three drive train components are tied directly together-floating independently, if you will-keeping everything in alignment is a lot more likely than it might be on a fast boat with the 343's rough-water joie de vivre.