Quote:
Originally Posted by ChazInMT
|
Thank you, I was using the version with the person standing next to it, but it was not "official" from what I was reading. In addition, there is now an even newer version with a more sloped windshield area, and that looks to be a work in progress as well.
Quote:
Originally Posted by ChazInMT
Oh. And you still can scale the thing if you want, and you're right, you'll probably have attached flow when you do scale it, but it won't be an optimized shape.
The template is a guide to optimize the shape of an Entire Vehicle, because when you scale it to fit, the top line of the rear portion automatically becomes the ideal shape the air likes to see for the least overall resistance taking into account the form drag and the skin drag.
|
I cannot argue with a thing said, it's pretty much what I've been trying to convey as a matter of fact.
Quote:
Originally Posted by ChazInMT
And most cars are flat on top for 4-6 feet across, making them something of a wide 2D shape, so you may wanna think about that before you muddy the waters with a 2D vs 3D thing. If you want to build a trike or bike, then you may not be able to make much use of the template because they are taller than they are wide.
|
The template overlay studies most people post are still in profile only, once in a while get posted in top view, but typically much later if at all. I'm sure that I'm guilty of the same thing here as I did not show the top view of the VW. It's an important issue, to remember in my opinion as real life is in 3D - and so are vortexes.
Quote:
Originally Posted by ChazInMT
Finally, 0.13 is the ideal Cd for a vehicle following the template.
Found it here |
Thank you ChazInMT, some of this information get buried very deep in the threads. I see that the most idealized number is only 0.08 without wheels and scraping the ground.
There seems to be room for improvement on the VW, 0.189 verses 0.08 of the ideal shape.