I remember my 126 body Benzes had a windscreen trim that extended over the windshield about n inch off the glass. What this did was trapped the air flowing around the cabin and created a pressure bubble. When it rained, this pressure bubble force the water to stay in the path of the wiper blades giving the river a full clear windscreen. I always thought this to be a cool idea.

This pressure bubble was created by ram air compression. It worked at relatively low speeds, say 45 mph. I believe the basic dynamics would be essentially the same as what we are discussing.

I have no idea what inH2O pressure this was. But it was enough to exceed the incoming air stream coming over the hood of the sedan.

Curiously, 123 body diesel Benzes had ram scoops under the front headlights. Again to create higher pressures in the intake manifold and provide more HP at cruising speeds. These disappeared on the later Turbo'd models. Germans didn't put things on their cars for looks, only function. Sump'in was going on there.


roadster with a stick