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Old 04-29-2009, 03:02 AM   #20 (permalink)
bwilson4web
Engineering first
 
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Join Date: Mar 2009
Location: Huntsville, AL
Posts: 843

17 i3-REx - '14 BMW i3-REx
Last 3: 45.67 mpg (US)

Blue Bob's - '19 Tesla Std Rng Plus
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Quote:
Originally Posted by Daox View Post
The rear angle looks to be roughly 14°. There is definitely a curvature to it though.

The picture doesn't look perfectly level though either. The front end is slightly higher than the back end (referencing the trim piece on the door). But, its only about half a degree. So, the rear taper is probably closer to 13.5°.
Thanks!

I used a spirit level with a scale and found the following:
  • 11 degrees - roof at junction with rear window mount/liner
  • 21 degrees - top glass near glass mount/liner
  • 28 degrees - middle of rear glass
  • 31 degrees - bottom of glass near junction with mount/liner
When I did my tuff testing, I only had a middle and lower region tuffted. I have to admit some surprise at the steepness. In fact, now I'm interested in seeing if I can measure the depth of this turbulent area.

I'll copy this data under my original tuff testing and continue the experiment. I have some loaner vortex generators coming and we'll get a chance to see the effect.

I also have a Kovatch "filter separator" pressure gauge that unfortunately has a scale that runs 0-30 psi when I need 0-30" of water. I'll have to modify the spring and calibrate it.

Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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