4. Fluid reaction surfaces (i.e., impellers)
  5. Articulated, resiliently mounted or self-shifting impeller...

Sune Ehrenskjold

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Folding propeller

Fluid reaction surfaces (i.e. – impellers) – Radially extensible or retractible rotor working member
Patent

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Propellar having optimum efficiency in forward and rewarded navi

Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller...
Patent

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