Retractable propeller for flat-bottom boat - has electric-motor(s) mounted in vertically movable tube enclosed in rigid tube forming part of structure

摘要

The electric motor system has two or more motors on a common shaft and is provided with a mechanical shaft seal, and a ship propeller. It is mounted on a vertically movable water tight tube enclosed by a rigid tube which forms part of the ship constructure. Water-filled flow compartment in front of and behind the tubes and are sealable as needed or are accessible by a hinging mechanism which is adjustable from the ship. The water accessibility can be provided by a grille of assembled rods with free ends and are attached at a hinge point, raised and lowered from the ship, ADVANTAGE : Protected from pollution, seaweed and shallows by lowerable motor system.