The biggest problem with the approach above is: if the mesh isn't wide enough you lose a lot of grain, but if it's too wide the blower needs to be ridiculously powerful and ends up blowing the grain away.
No matter how he thought about it, it felt difficult.
The dumbest way is to not care about straw getting tangled on the mesh and just let the mesh wrap up the entire bottom of the thresher; that way, separating grain from straw becomes very easy.
Then how do you get the straw out of the thresher?
Split it into multiple "tunnels" and blast hard with a blower.
This kind of blower is very easy to install.
The grain and straw fall into a row of cells. Inside each cell there's a strong airflow.
This method still isn't good.
Ma Lin was utterly stumped by the thresher.
With no ideas for several days in a row, he decided to work on something else first.
He started reconsidering how his hydrogen-burning internal combustion engine should be built.
