This document describes a patented bi-directional wave and tidal energy converter with only two moving parts that can harness energy from both waves and tides. It uses a simple drive train design with one-way freewheel bearings and a common drive shaft to allow rotation in one direction regardless of changing fluid flow direction. This versatile and low-cost technology has potential to meaningfully contribute to global sustainability by capturing energy from ocean waves and tidal flows.

1. A simple means to harness
Bi-Directional flows for Wave
and Tidal Energy Converters
U.S. Patent 8,358,026

2. NEW TECHNOLOGY
Simple - Only two moving parts
Versatile – Wave OR Tidal Energy
Adaptive – Multiple configurations
Low Cost – Off-The-Shelf parts
Robust - Built for decades of use
Accessible – Easy to maintain
Scalable – Single or multiple array
Consistent – Waves and tides
Patented Wave & Tidal Drive Train

3. TIDAL TURBINE
(1) Turbine airfoil or vane
(2) Hub
(3) One-way freewheel bearing
(4) Common drive shaft
(5) Housing for generator or pump
(6) Alternating fluid flows
(7) Rotation of one-way shaft
(8) Optional nacelle or duct
Direct Drive, 1 to 1 Ratio, No Transmission

4. Wave Turbine – Bent Duct Version
Uses the same patented drive line
as the tidal turbine
Two moving parts - Dual Rotors
Bent Duct version (shown) to save
space
Inline version (next page) can be
vertical or horizontal
Shore or Buoy Installation
Drives Two Generators: can use
conventional or annular ring type

5. Wave Turbine – Inline Duct Version

6. Operating Principle – Wave or Tidal Versions
The dual rotor blades are mirror Flow direction alternates back and forth. The
images of each other. The rotor upstream rotor always turns the drive shaft.
blades’ leading edges point out. The downstream rotor will always freewheel.
Regardless of flow direction, the shaft will always spin in one direction!

7. TIDAL INSTALLATION METHODS
Stand alone on seabed
Seabed Array
Fixed Onshore Array
Floating from Surface
Rivers, Estuaries, Bays

8. WAVE INSTALLATION METHODS
Nearshore Buoy
Onshore Jetties or
Breakwaters
Offshore Oil & Wind
Platforms: Legs or
Suspended Below

9. CONCLUSION
• It is estimated that the world’s
oceans can provide 8,000-
80,000 TWh/year of power
from wave and tidal energy; a
third of the world's current
annual electricity consumption.
• The wave and tidal converter
described here offers a simple
and practical design to make a
meaningful contribution
towards global sustainability.
• The patented drive train is
unique. It’s the reason the
turbine works. There is nothing
like it in the wave or tidal
energy sector.
• The Hanna technology is
versatile. There are no other
marine energy inventions that
can serve both the wave and
tidal energy sectors!