Redpill me on meme rear windshields. Like the ones on Priuses

>>17424234
The ones on the prius actually aren't bad. The spoiler is annoying at first but you stop noticing it after a while. Couldn't say anything for the civic

>>17424234
>To me they seem utterly ridiculous
Have you ever tried driving a car with a small rear windshield? It's really not a problem if your side mirrors are adjusted right.

>>17424281
The point is, why make them small (and extremely slanted) in the first place? Is there a good practical reason or is it all about superficial (((design)))?

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>>17425640
aero

>>17425658
Shhh, if he didn't already understand that the shapes of objects moving through a mass of air had a shape for a reason by now, he never will.

>gee why don't rockets have square shaped noses and airplanes have rear ends shaped like a barn? Hmm.
>things you should understand from grade school science
>moving air? How does that work? MAGIC!

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Aztek did it better.

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>>17425658
>>17425690
Why does the shape of the back matter when the wind comes from the front and flies off the top?

>>17425826
You have to be 18 to post here

>>17425826
It literally shows you in the picture you replied to

>>17425658
This, Priuses have one of the lowest Drag Coefficients of all cars.

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>>17425842
>>17425852
>>17426108
Ok maybe I just don't understand, I didn't take physics past age 16. But explain to me why the shape of the back matters? Doesn't the wind just fly off the top? Why would it be any different for the 2 cars in my crude illustration? I don't get why the air would come back down.

>>17426265
the gigantic gap at the rear where air is not flowing creates turbulence because it essentially works like a plunger, sucking air forwards with the car.

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>>17426265
Simply put, the shape of the body causes there to be a pocket of station air behind the vehicle that is dragged along with the vehicle when it moves, hence drag. The weight of this air is effectively added to the weight of the vehicle. In order for the vehicle to move, it must not only move itself forward but also move the pocket of air trapped behind it. Changing the body shape to reduce the size of the stationary pocket of air reduces the amount of effective weight the vehicle must move.

>>17426265
>>17426599
Also
> I don't get why the air would come back down.

The reason the air "moves" down is due to air pressure. Take a look at the front of your drawing. You have air not just from the very nose of the vehicle, but all heights up to the roof, hitting the front of the vehicle and behind forced up to the roof. All of that air combines into one high pressure stream just above the roof of the vehicle, relative to the rest of the air in the environment.

Air pressure exerts force outwards in every direction, so when there's a high pressure zone and a low pressure zone, the high pressure zone pushes the low pressure zone out of the way and presses itself into the former low pressure zone. The result is a zone of moderate pressure.

When the top of the vehicle slopes down after the roof, that introduces a low pressure zone just above the back half of the vehicle for the high pressure stream above the roof to expand into. It doesn't "move" downward so much as expand downward as the two different air pressures begin to equalize.

>>17426556
>>17426599
>>17426641
Got it. Thank you. Very helpful explanations.

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https://en.wikipedia.org/wiki/Kammback

>>17425658
a 1995 volvo 850 has a drag coefficient of 0.29

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What about 911 and Gaymans? They've got that fastback rear and don't seem to have a huge drag area