Underwater propulsion unit

An underwater propulsion unit comprising:

• a propeller coupled to a motor via a propeller shaft, the propeller shaft rotatably supported by a bearing, the propeller interposed between the bearing and the motor;
• the motor that is disposed further forward in a propulsion direction than the propeller and is configured to drive the propeller into rotation;
• and
• a housing configured to accommodate the motor and the propeller, the housing including:
• a first portion, and
• a second portion that is disposed further rearward in the propulsion direction than the first portion, and
• wherein:
• an introduction inlet and a spout outlet are provided in the second portion,
• the introduction inlet is configured to introduce water into the housing in a direction parallel to an axis of the propeller,
• the introduction inlet includes a first introduction inlet and a second introduction inlet,
• with respect to the propulsion direction, a radial circumference of the housing is defined by the first introduction inlet to a third portion of the housing to the second introduction inlet and to a fourth portion of the housing,
• the spout outlet is configured to allow water introduced from the introduction inlet and delivered by the propeller to be spouted out of the housing, and
• when viewed in a direction parallel to the propulsion direction, the introduction inlet is disposed further outward than the first portion.