Why do the Model 3's windows roll down when you open the door?

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PatrickM

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#1
Does any one know why Tesla designed the doors and windows on the Model 3 such that they roll the window down slightly when you open the door? I can see it's so that the windows clear the trim, but why did they do that? Why not just make the windows such that they go past the trim without that little pull down of the window? Is it for aerodynamics or something else?

Thanks for any insights.
 

Rich Nuth

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#2
As you stated, its to clear the trim. The reason for this is to ensure a tight seal to eliminate wind noise. Without the overlap, the window system can allow flex and enable air leaks at the gasket which can be really annoying. The overlap alows for a tight window to gasket seal.
 

TrevP

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#4
It’s to clear the chrome trim and create a positive seal for the windows
 

Dogwhistle

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#6
I guess the follow-on question, why not just do framed windows? Less complex, right? Easier to seal?
 

MichelT3

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#8
Frameless windows are more aerodynamic, because the frames cause drag.
I expect that when windows move up they also tighten against the trim and in the door. Preventing rattle and airleaks.
 
4

4701

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#9
Frameless windows are more aerodynamic, because the frames cause drag.
Only if framed doors are design poorly. Same applies to poorly designed frameless windows.

Reason why Tesla does frameless style is due to simplicity. Framed windows, AFAIK, are noticeably more complex with not a lot of pros.
 
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4701

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#12
There's still an extra cutline for the door frame, no matter how well it is designed.
But it is (can be) flat... aka frame is on the same plane as body. In terms of aerodynamic drag, it doesn't change Cd. I bet inconsistent panel gaps Tesla produces matters more.



 

MichelT3

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#14
Obviously, inconsistent gaps are just that; inconsistent. Thus, gaps that shouldn't be big. AFAIK there may have been inconsistent gaps at the beginning of production for Tesla workers, but they are not there any more in the current production models.

Further: by definition a frame can be in the plane of the body panels, but the glass will never be - with frames.
However, frameless glass can be in the plane of the body panels. And it is.

Actually, doors with frameless windows are more complicated; controlling the position of the window.

EDIT: Yes, @OrangeJulius, 'window hop' is also done by other carmakers with frameless windows. Often those windows also move inward on that last inch.
 
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