Water Jet drive

thingiverse

A tiny high-pressure pump drives a spinning blade at the end of a small motor's output shaft to produce a focused stream of fluid, propelling an 18:1 scale Himoto vehicle. A miniature power source pushes the 4mm shaft at its center. As water passes through the central part of a rotating 25mm disk with blades that move very quickly and efficiently to make thrust, they exit through nozzles on the end opposite from the pump. This type of mechanism propels many remote-controlled or robotic devices underwater, often for aquatic exploration purposes or underwater inspections at extreme depths where an air-powered motor would struggle against resistance and could get easily stuck due to seawater corrosion problems.