Ski like protrusion that holds the front of a vesel out of the water when at speed. Aids economy, reduces drag. Search for Hydrofoil books on Amazon.co.uk

A wing-like structure that raises part or all of a powerboat's hull out of the water.

A surface immersed in water underneath the planing bottom of a hull or float to assist take-off with its hydrodynamic lift.

A marine wing. When it moves through the water a hydrofoil creates lift, which lifts the vessel or animal it is attached to out of the water.