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
the edge on hatchbacks creates a low pressure section on the vertical glass part, which sucks and curls the air back towards and up on the glass, making it stay more easily. other cars may have the low pressure section below the glass. you’ll notice the bumper and license plate area are usually more dirty.
see this pic https://youtu.be/n7EYKVEL7Ds?si=tud7CESKRbksWgr1&t=442
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