Saildrives resemble an outboard, dispensing with conventional sterngear and emerging from the boat’s hull direct. 1
Hull. 2 Seal. 3 Ahead/astern/neutral gears. 4 Drive shaft. 5 Bevel gear. 6 Folding propeller.
Saildrives have integral gearboxes and drive the propeller via a bevel gear train and integral propeller shaft, rather like an outboard engine. They need to be lubricated and maintained to manufacturer’s recommendations.