[Snax]

The 'ducted radiator' concept is a very valid idea. Formula1 teams have taken radiator duct design to the point where they actually produce a net thrust from the heated air expansion. The thrust is miniscule, but it illustrates the point that a radiator does not have to induce drag. (The whole system is still a net loss in power when the energy required to pump the coolant to the radiator is factored in.)