This concept drawing shows a 5-vane involute-spiral-vaned water turbine mounted on 4 pilings in a tidal current. Above the water turbine and a platform is mounted an involute-spiral-vaned wind turbine. This concept is explained in detail in another area of this website. These are both drag-propulsion devices, which have the potential of harnessing much more power than lift devices from slow-moving fluids, especially water. The involute spiral has the unique property of creating a non-constricting path through the turbine, which is essential for harnessing maximum power from water, which is non-compressible and 800 times as concentrated as wind power.
Both turbines are connected to generators which provide power for electrolysis of water to produce hydrogen and oxygen for storage in the two cylindrical tanks below. This allows remote on-site storage of variably-generated electricity converted to hydrogen, which can be directly transferred to ships to power their own engines and to transport elsewhere.
Many variations on this design are proposed for different situations, and there are more efficient designs than this for tidal power, which is especially promising for harnessing tidal power here in Puget Sound, WA, where vast tidal flows surge in and out of this large inland sea daily.
The hyperboloid venturi pictured here is especially promising for submerged low-flow tidal current power.