The main advantage of the invented hollow hydrofoil blade is a special design that exploits three types of rotational forces:
1. Hydro jet forces
2. Hydrodynamic lift
3. Helpful drag forces

The blade is a unique blade worldwide. In the hollow blade part (by rotating) the centrifugal force is constantly transforming to jet streams behind the blade that creating rotational jet torque. At low water speed the rotational jet torque is creating by flow redirection in the hollow blade. Because of the invented blade all jet blade turbines increased both blade velocity and efficiency. High blade performance is achieved by significantly reducing of no helpful blade drag forces, (especially inductive loses) and enhancing helpful drag and by improving of the blade hydrodynamic lift. The jet blade  allowing the turbine to be scaled independently in horizontally or vertically to fit to existing environment. The jet blade turbines have very good performance at low flow velocity. See a scheme of a hydro power plant with over water drive power train coupled to the vertical shafts of the under water counter rotating Jet Darrieus turbines. 

Counter-rotating turbines have several advantages:
• Minimized water space needed – more compact hydrokinetic power plant
• Reducing significantly resultant dynamic stress and vibrations of the hydrokinetic power plant structures
• Summarizing of the turbine rpm that allow to increase of gear box efficiency in the case of geared drive train

Building the dam of conventional hydropower plants using high head turbines is very expensive and a large area of land is flooded – which have big ecological impacts on local wildlife. The invented turbine for low velocity water flow enable mankind to tap into thousand, thousand kilometers of river the forgotten renewable energy source, to be placed where it needed, voiding the high cost of transmission loss. After generating power; the new jet blade turbine will lowering the speed of the free water stream to reduce the river bank and soil erosion problems.

The jet blade turbine is a uni-rotational machine in omni-directional flow that is applicable as a prime energy converter in the tides and wave power plants.

Tides and marine currents are predictable and they can be used as a dependable base line supply. Water currents are analogous to air currents. Because water is so much more dense than air, a 22 х 17 m (370 m² swept area) vertical axis Jet Blade Marine Turbine operating at current velocity of 3 m/s could produce similar rated power as a 60 m diameter (2 800 m² swept area) horizontal axis wind turbine operating at 15 m/s (e.g. ~ 1 MW). Such marine turbines are anticipated to be installed at depths of 30 – 40 m. The jet blade hydrokinetic turbine design allows to reduce significantly the cost of electricity generated  at the level as low as the utility grid prices at present. There are a large number of tidal sites in the world's oceans which can provide a significant, viable and cost effective source of reliable energy. Many are strategically located close to populated areas where they can be economically harnessed using an ecologically benign zero- and low-head technologies developed by presented jet blade including jet blade turbine applications in natural and artificial vortices.

Invented jet blades are applicable to wind turbines, as well. A short presentation of Darrieus wind turbines with new invented jet blades see here.

A short presentation of the new invented vortex hydro power plant and under water power plant with jet self augmented Savonius turbines see here

Number of JET augmented  hybrid vertical axis hydrokinetic turbines ( fixed to a common shaft  Savonius JET scoops and straight JET blades) are developing. The performance coefficient of self JET augmented turbine is increased up to 2.5 times in the comparison to the conventional blade turbines.

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