Fer.Fan wrote: ↑14 Mar 2021, 13:37
Why is new better? What is the main difference compared to old one?
They have placed a fence (the panels that hang down in the diffuser) either side of the central portion of the diffuser. This central section is shorter and steeper than the main part of the diffuser. It's normally "pyramidal" but the fences make it in to a narrow but steep diffuser. This ought to allow it to make some extra downforce.
new diffuser
old, and typical, diffuser
If you are more fortunate than others, build a larger table not a taller fence.