Why do hatchbacks have rear wipers while sedans don't?
1 Answers
The reasons why hatchbacks have rear wipers while sedans don't are as follows: 1. Structurally, sedans lack a suitable position for rear wipers: Hatchbacks are typically liftback models where the rear glass and tailgate are integrated. The wiper pivot is installed on the metal body beneath the rear window, so opening the tailgate doesn't affect the wiper. Sedans cannot mount the wiper pivot on the trunk lid (let alone on the glass itself). If installed on the trunk lid, when opened, the glass remains stationary, causing misalignment between the wiper and glass, making it unsuitable for installation. 2. From an aerodynamic perspective, sedan rear windows stay cleaner: For straight-back hatchbacks, the airflow separation point is at the roof's rear, creating turbulent low-pressure zones that lift debris onto the rear window. Sedans have their separation point at the trunk edge, only dirtying the rear bumper while keeping the window clean. The curved rear window design also helps blow away debris. 3. Sedans' trunk blocks wheel spray: The additional trunk compartment in sedans effectively shields most road spray generated by rear wheels, preventing dirty water from reaching the rear window. This reduced contamination need makes rear wipers less necessary for sedans.
