Nice to see you up and running again Bill, motivating as ever.
Radiator engineers are a very cautious bunch when it comes to making conclusive statements, its always a lot of testing, tweaking, prototyping, testing, tweaking, prototyping, tweaking...and on and on.
Fundamental factors remain the same, waterside/airside surface area, airside pressure drop, flow resistance...how far discussions go will depend on what people are willing to contribute along those lines.
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