4. Fluid reaction surfaces (i.e., impellers)
  5. Cupped reaction surface normal to rotation plane
  6. Torque converters

Frederick C. Evans

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Flow augmenters for vertical-axis windmills and turbines

Fluid reaction surfaces (i.e. – impellers) – Cupped reaction surface normal to rotation plane – Torque converters
Patent

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Interlinked variable-pitch blades for windmills and turbines

Fluid reaction surfaces (i.e. – impellers) – Sustained ancillary movement of rotary working member – Responsive to gravity or working fluid force
Patent

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