Ialtuxhe Propulsion is a liquid propulsion technology used in boats built in the port of Putvå Iāltuxhe. The system is known colloquially as eingtuān.
The apparatus consists of a large wooden or metal propeller attached to a looped piece of rope and a rigid central rod. Potential energy is stored by rotating the propeller while one point of the looped rope remains in a fixed position. Originally, projects were small in scale, and laborers or slaves rotated the pieces by hand. As the propulsion systems grew in scale, this became an extremely laborious task, and new methods were needed to satisfy energy needs.
The most accepted of these methods eventually became known as pulůleng rīrquān, or Waterfall Rotation. Eingtuān are assembled beforehand, then brought to the waterfall area of Pulůleng. The falling water provides the rotation and storage of energy in the rope. Rotation can also be performed in mills situated along rivers. Eingtuān are fitted within large wooden wheels, which are then rotated using the movement of river water, human power, or a combination of both.
The most obvious application of eingtuān is in nautical propulsion. Ships may be equipped with one or several eingtuān engines. Additional unused eingtuān are also stored on board and are used to replace used eingtuān. This obviously has limitations, and most Ialtuxhe ships tend to use other types of propulsion along with eingtuān.