High performance mono propeller thrusters. Hydrodynamic base in bronze and 4 blade composite propellers guarantee durability,corrosion resistance and high efficiency for minimal current consumption. Protective housing for composite relay,flexible coupling (exclusive Quick) and strong anodized aluminum motor support. New generation engines designed to operate continuously in harsh conditions. (Protection against overheating provided by a microprocessor), reversible couple with delay, auto stop timer. Available in retractable version to protect the hydrodynamic qualities of the hull through a reliable and secure installation system.(requires the installation of a flange option)