Propulsion device for ship and ship having the same

This ship propulsion system uses two propellers, one in front of the other on the same shaft. A motor spins the main shaft, turning the rear propeller directly, while a clever gear system reverses that spin to make the front propeller rotate in the opposite direction for improved efficiency. All these components are housed within a protective casing extending from the ship's hull.

Why it matters: The push for electric marine propulsion and improved battery efficiency since 2011 makes this fuel-saving counter-rotating design more attractive. Advanced computational fluid dynamics can now optimize its complex hydrodynamics.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedCustom propellers, precision marine gearing, hull integration.

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