A British surfer has been filmed tackling 'vertical' 50-foot waves in Portugal on board a 'flying' surfboard. 

New footage shows Tom Court, a professional kitesurfer from the Isle of Wight, riding an efoil over the waves off the coast of the Portuguese town of Nazaré. 

An efoil is a board with a hydrofoil and an electric motor to power forward momentum, letting the rider fly over the water as if on a magic carpet. 

Hydrofoils are wing-like blades underneath that cut through the water as the board speeds up, creating an uplift, similar to the aerofoils used on aeroplanes. 

Unlike a regular surfboard, an efoil lets riders 'hover' above the water even when there is no wind or waves and the water is flat. 

In the footage, which was filmed earlier this year, Court is riding Fliteboard, an efoil developed by Australian firm Flite that can reach speeds of 25 miles per hour. 

The board's speed and direction is controlled by a handheld Bluetooth remote, as well as the rider's body weight.