Hi Following on from this thin vs thick radiator discussion. What's the general consensus on placement of the heat exchanger/s? Seems to me the most efficient WW11 planes had the exchangers mounted under the wing or fuselage but nearly everyone here is placing them under the cowl, is the reason for this just because its an easier installation to make, or is it no less efficient at our power/speed. My aim is to minimize total drag even if it means a longer build time to get the installation correct, current thoughts are to place a short thick coolant exchanger under the fuselage and have a clean tight fitting cowl with only inlets for induction and oil heat exchanger, hopefully there will be enough air going through the oil exchanger to keep under cowl temps reasonable. Am I just plane crazy? Regards Andrew Martin. -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html