An underwater propulsive device of a watercraft with a reduced load to a motor is provided. An underwater propulsive device 20 of a watercraft 1 including a flotation unit 2 on which a user rides includes: a hollow body 21 coupled to the flotation unit 2 through a strut 3 and extending in a propulsive direction, inside of the body 21 being divided into a first compartment 27 at a bow side and a second compartment 28 at a stern side; a motor 22 housed in the first compartment 27; a propeller 23 housed in the second compartment 28; and a power transfer shaft 24 extending in the propulsive direction and connecting the motor 22 and the propeller 23 to each other. The first compartment 27 has a waterproof structure. The second compartment 28 has a water inlet 29 disposed closer to a bow than the propeller 23 is and extending along a circumference of the power transfer shaft 24 and a water jet outlet 30 disposed at a stern-side end of the second compartment 28. The propeller 23 has an outer diameter smaller than a diameter of the first compartment 27.
UNDERWATER PROPULSION DEVICE FOR WATERBORNE VEHICLE
UNTERWASSERANTRIEBSVORRICHTUNG FÜR WASSERFAHRZEUG
DISPOSITIF DE PROPULSION SOUS-MARINE POUR VÉHICULE NAUTIQUE
2019-12-18
Patent
Electronic Resource
English
Waterborne propulsion resistance reduction device for all-terrain vehicle
European Patent Office | 2016
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