Voith Schneider, otherwise known as cycloidal drive systems are often used on vessels that require a high degree of manoeuvrability, particularly at slow speed. These include tugs, fireboats and workboats. Vertically mounted hydrofoil blades are mounted on a rotating plate. The blades are linked to a control system which automatically alters their angle of attack as they rotate to provide thrust in the direction selected. The system is highly efficient and can change the direction of thrust almost instantaneously in any direction. They are often used in pairs, so a vessel is able to spin on its own axis or move sideways if needed.
