In power ranges from 20 to 75hp, Z drives are a transom mounted solution that is proven and flexible.
Z drives provide an efficient propulsion system for electric motors with power ratings from 15 to 50Kw.
Attached to the transom and with a thru-hull fitting to a horizontally mounted motor, they are easy to install. The units can be tilted up for protection or to reduce drag. Unlike the turbine solutions listed separately, they do not offer a regeneration facility. They will therefore need a larger battery installation.
Overall they are better suited to power boats and inland water craft than to sailing yachts.