View Single Post
Old 08-29-2012, 06:05 PM   #4 (permalink)
some_other_dave
Master EcoModder
 
Join Date: Jul 2008
Location: Silly-Con Valley
Posts: 1,479
Thanks: 201
Thanked 262 Times in 199 Posts
First, on the red car you have taken the photo from above the car, so you can see the roof panel and the top of the boot. You should take the photo with the camera at roughly half the height of the roof of the car. And a photo from a long distance (with a telephoto lens, or just cropped if you've got good enough resolution) will help as well.

There may be a similar problem with the estate, so it may need another photo as well.

Second, the highest part of the template should overlay with the highest point on the vehicle. The bottom of the template should be on the same plane as the bottoms of the tires, which should compensate for the camera not being perfectly level with the car.

You can probably ignore the roof rails on the estate (wagon), especially if you plan to remove them. You should, they definitely contribute to drag!


So I would say that none of your pictures show the template properly applied. For one thing, the front of the template is too low; the front tire of the car is above the ground plane line of the template. The first image of the red car looks like it is aligned reasonably fore-and-aft, but it is difficult to tell because we don't have a pure profile and the template and vehicle are sitting at slightly different angles.

I don't think either image of the estate is lined up correctly, because they are lining up on the roof rack. Which is one of two narrow projections, and does not characterize most of the roof line of the car.

-soD
  Reply With Quote