I think that the major advantage of this lift design is that while on a traditional setup you have to work against the friction between the container walls and the grain, with this design since the walls are moving mostly with the grain a lot of that friction is reduced and what is left of it is actually used to do work on the grain.<br><br><br> Also, the spiral's shaft does not have to be perfectly aligned with the outer casing because of that huge gap between its edges and the casing walls, which means that it's easier to build way longer elevators at a fraction of the production costs of a traditional type screw elevator (where tolerances have to be much much stricter and increase drastically with the total length of the shaft).<br><br><br>very cool design