George Lendich wrote: 

“I'm still trying to get my head around those kick-outs on the

aft end of the rad outlet. I'm trying to confirm WHY they work - anyone got any suggestions.”

 

George ( down under)

 

Hi George, those kickers are the same as a cowl lip, seen on most 100-120 mph tail-draggers – they protrude into the airstream to generate a low pressure area behind them, in this case behind the radiator exit plenum to assist the airflow through the cooler.

Jeff