Considering the Feser radiator I tested was a prototype, there is a good chance things could change for the production model, so I've have removed the Feser curve as a comparison. As far as I'm concerned they were nearly equal in pressure drop and this whole thread is a waste of hot air because that little leak amounts to nothing at all.
The TC PA120.3 I tested was a production model, and they all have that same divider plate. They are all cut and pressed formed on the same machine, so my PD result is a good test, it matches real world production samples, and it matches TC's own testing (Which BTW the fact that they publish that sort of real scientific data on their own website is EXEMPLARY

).
There are only two very simple things that define the performance of a radiator. Pressure drop for how restrictive things are and C/W curves for various fans that defines thermal performance relative to flow rate and different fan types. Every product out there has to make some trades between restriction and thermal performance, but high restriction doesn't mean high performance, there is good and bad restriction. Restriction that improves velocity and turbulence at critical and necessary areas is good restriction, and restriction that causes no performance gain is bad. Post both pressure drop and c/w curves on your website and you've defined performance and the trades between the two.
And here is my suggestion for removing more bad restriction from radiators. If you want to reduce pressure drop, clean up the flow tube ends inside the plenum chambers. Either flare them out as much as possible or cut them off flush and radius the ends. The entrance losses into the tubes probably accounts for half of the total restriciton in a radiator. I think most radiators could reduce restriction there by 30-40%. In fact I may even take my old bonnie heatercore and cut it open to demonstrate my theory.
Now how about some "constructive" improvements and advancements to products

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