I took Suzzy to the park for a belated retrieve-the-tennis-ball-run
after being out of town for two weeks.

It was a windy day and there was a large building next to
the park. If you want an excellent illustration
of what happens with a radiator mounted too close
to an engine step out side and try it.

As you get closer and closer to the up wind side
of the bldg the wind velocity dies down drastically.
It is also a good illustration of external diffusion.

Paul Lamar