Gorlov helical turbine

GHT, Turby and Quietrevolution solved pulsatory torque issues by using the helical twist of the blades.

The term "foil" is used to describe the shape of the blade cross-section at a given point, with no distinction for the type of fluid, (thus referring to either an "airfoil" or "hydrofoil").

The turbine generates a smoother torque curve, so there is much less vibration and noise than in the Darrieus design.

[8] The GHT is a unidirectional turbine, operating under a lift-based concept (see airfoil), providing rotation in a consistent direction from bidirectional or reversible fluid flows.

Some advantages of damless hydro are that it eliminates the potential for failure of a dam, which improves public safety.

In general, a major ecological issue with hydropower installations is their actual and perceived risk to aquatic life.

A fish also would not be tumbled around in a vortex, because the GHT does not create a lot of turbulence, so small objects would be harmlessly swept through with the current.

The remaining force component propels the turbine in the clockwise direction, and it is from this torque that energy can be harvested.

[With regards to the figure "Apparent flow velocity...", Lucid Energy Technologies, rights holder to the patent to the Gorlov Helical Turbine, notes that this diagram, with no apparent velocity at an azimuth angle of 180 degrees (blade at its point in rotation where it is instantaneously moving in downstream direction), may be subject to misinterpretation.