The angle of the glass on hatch backs varies from straight up and down to almost horizontal. They almost all have a rear wiper.
sedans and coupes can have similar glass angles, yet don’t have rear wipers.
why?
In: Engineering
There’s a circular air vortex at the end of the object when it moves.
On a sedan that vortex sits behind the trunk and bumper, and the back window is a few feet away, so snow/grime doesn’t reach the rear window, most of the snow and grime settles on the back of the trunk and bumper.
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With a hatchback, the rear window is not distanced from that vortex, so everything just whips around and lands on it.
Tesla Model Y for example, which looks like a hatchback, doesn’t have a rear wiper. Tesla controls that vortex with a very concave rear trunk wing design, so it doesn’t reach over the lip and onto the glass.
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