[Gulp35]

I've read on some of the less wise forums (OC.com, HardOCP.com) that when running fans in series that they had to be spinning in separate directions.

I know this is false (ex. Jet engines all turbines turn the same way) but would using a adapter, reducing the fan size and increaseing the velocity of the air (similar to what happens in jets and turbofan engines) increase performance in radiators? and thus reducing the size of radiator for a given cooling capability (ex. Cathar you could use only one of your Big Arse radiators instead of two).