A water jet propulsion system made for RC boats. motor: 2205-2208 drone motor (the motor mount is exchangeable) bearings: 693ZZ (3x8x4mm) shaft: 3mm o-ring: 5x1.85mm brass "bearing": OD 4mm, ID 3mm screws: M2

A pump-jet works by having an intake (usually at the bottom of the hull) that allows water to pass underneath the vessel into the engines. Water enters the pump through this inlet. The pump can be of a centrifugal design for high speeds, or an axial flow pump for low to medium speeds. The water pressure inside the inlet is increased by the pump and forced backwards through a nozzle.

Deep well jet pump

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A project I worked on in parallel with my product design studies. Designed to "work" and be as realistic as possible, although an engineer would probably point out how inefficient axial compressors are at this scale if they ever saw this.