Quote:
Originally Posted by Vekke
I have done some overlayes conserning my roof chopping and this is bothering me this is correct overlay and its way off:
If I put it about 250-300mm too toward the front it layes perfectly:
So the guestion follows:
If you put the template too much in front of the picture is still layes perfectly ok to the shape. So can I do the same in my lupo and still get nice flow. My own estimation is that when you are at the max roof camber you can make that first few degrees pretty rapidly like those pictures prove or what do you think?
This may be true only if you begin the cambering at the max camber point etc?
third option:
Now template aligned at car underside lowest level and its quite nice match on the roof. Note that sidesills are lower than the cars underside, because its better aerodynamically that way.
Plan is to begin the rood chopping this weekend so would like to get some feedback. My own estimation is that the xl1 roof camber is streamlined in wind tunnel and there is attached flow...
On the 2009 vw L1 model the roofline is according to the template so VW has finded somenthing after that... |
*The 'Template' should be positioned only as originally intended or we run the risk of jeopardizing boundary layer attachment.
*I've done a comparison of the 2009 1L car and got the same thing.Online,there is the original concept sketch of the 1L car and it is dead-on the 'Template.' Rear visibility may have been a factor in running the roofline a bit faster.I don't know.At Cd 0.195 the 2nd-gen car has higher drag than the 1st-gen of Cd 0.159.
*One of the members posted a color photo of maybe the 3rd-gen 1L in the wind tunnel under smoke.It looks very good!
*Hucho's associate at VW,Rolf Buccheim (sp?) reported that we could go as steep as 23-degrees.If you can morph the 'Template' to include a max tangent angle of 23-degrees within the 1st 80% of the aft-body,you'd probably have a strong confidence for success if you wanted to try it.