First, because the hatchback are generally liftgate, rear glass and rear doors are one, wiper shaft mounted on the rear door glass beneath the metal door, the back door when off, will not affect the wipers. And behind the relative hatchback sedan more than a trunk shelter, no place to install wipers. Imagine, the wiper shaft is mounted on the tailgate when the lid is opened, the glass is not moving, then the wipers and the relative position of the glass will be misplaced, it is not suitable.

Secondly, this is a question of fluid mechanics, the car is moving because of the car's air space crowding out the appropriate size, the car moves in the air due to the viscous properties of the fluid, can not quickly fill the row after row of cars open air open space. Therefore, in the rear of the formation of a vacuum to form a vortex. Due to eddy currents, than at the rear windshield windshield hatchback sedan is easy to form, after a bigger negative pressure, but also easier to roll up after the dust pollution windshield, rear impact visual function. The rear wheel drive sedan produced by almost all sewage to block the entire trunk, do not create a situation where the volume of sewage after glazing.

So at the rear windscreen hatchback generally equipped with wipers, rear window when rain or contaminated, you can get turned on the wipers clear rearward visibility. But not absolute, rear hatchback sedan also has wipers after equipment, but nothing unusual.

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