An oar is a tool used for water propulsion. Oars in general have one flat blade at one end. The user grabs the oar at the other end.

Water Propulsion Oar

An oar is a tool used for water propulsion. Oars in general have one flat blade at one end. The user…

A rudder supported on a skeg or projection from the keel, about one third of its surface being forward and two thirds abaft its vertical axis.

Balance Rudder

A rudder supported on a skeg or projection from the keel, about one third of its surface being forward…

An apparatus which, being fitted to ships and driven by steam, propels them through the water.

Screw-propeller

An apparatus which, being fitted to ships and driven by steam, propels them through the water.