1. Stingray Uses an oscillating aerofoil to extract energy from
marine currents. Hydraulic power take-off system
Artist’s impression of a “farm” of Stingray devices

2. Stingray trial deployment in Yell Sound, Shetland, September 2002.
Device produced 90 kW output in 1.5 m/s current speed

3. Prototype 300 kW marine current turbine near
Lynmouth, Devon. 2 blades, rotor diameter 11 m
Project
managed by
UK company,
Marine
Current
Turbines Ltd.
No yaw
mechanism
and no
electrical
connection
to shore

4. Marine Current Turbines
Artist’s sketch
of a 3-bladed
turbine on a
monopile
tower

5. Artist’s sketch
of a twin 2-bladed
installation.
Rotors would
contra-rotate to
minimise the
reaction torque
on the structure

6. Marine current turbine by Strom AS, Norway
Rated at 300 kW, rotor diameter 20 m
Deployment
in fjord near
Hammerfest
early 2003.
Turbine has
a tripod
supporting
framework
with gravity
ballast