Cd's post on another thread caused me to think
Let's do a different think...
The back of a pickup is a cavity; the bucket headlight is a cavity. The pickup's least resistance is with the tailgate up which allows the air to form a ball in the bed of the pickup, around which the air flows with least resistance.
The bucket headlight perhaps acts like the bed of the pickup, but on a smaller scale. A ball forms in the bucket and the air flows around the ball with least resistance.
Does this make sense to anyone else?
My best skills were used on the illustration...
