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This invention describes a compact propeller system designed for boats, where two propellers spin in opposite directions on a single shaft. A set of gears hidden inside the first propeller's central hub takes power from the drive shaft and makes the first propeller spin one way, while also making the second propeller spin the opposite way. The claims specifically narrow this to a version where all the necessary gears are contained entirely within the first propeller's hub.
Why it matters: The drive for greater fuel efficiency and compact electric marine propulsion systems has intensified since 2006. This compact, integrated design could offer significant advantages for modern vessel architectures.
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