Wow - nice link Les.
I've been designed a better forced convection radiator (or trying to) and so didn't see this bad assumption. Passive rads will result in a higher coolant temp and hence the fins can be bigger which means that the whole thing can be smaller.
Eg: 8 x 20mm fins on 7 x 1/2" pipes now only 0.5m tall.
That linked sites gots lots of nice calcs....
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