View Single Post
Old 08-11-2017, 11:08 AM   #11 (permalink)
Ecky
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: Vermont
Posts: 1,946

Gaptooth - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 69.77 mpg (US)

Work Van - '16 Chevy Express 2500
90 day: 17.37 mpg (US)
Thanks: 616
Thanked 702 Times in 452 Posts
A kammback - which is basically a truncated boat tail - is probably most appropriate, as freebeard is suggesting.

Aerodynamics is a bit of a dark art, as far as I can tell. Although there are plenty of design guidelines that work reliably, you'll find that intuition often doesn't work with complex shapes. You can be pretty certain that, although the tiny kamm on the back may poke out of the profile, it almost certainly lowers drag overall, or Toyota wouldn't have put it there. The RAV is a very complicated shape, and the kamm could be correcting for something like the mirrors, or perhaps the windshield angle is too steep for there to be attached flow along the front of the roof, but it reattaches at the rear. Without doing extensive testing, you just can't know.

It's not a technical article, but I was amused by this recent post on Jalopnik:

deadspin-quote-carrot-aligned-w-bgr-2<\/title><path d="M10,3.5l3-3,3,3Z" style="fill:%23fff;stroke:%23fff"/><path d="M0,3.5H10l3-3,3,3H26" style="fill:none;stroke:%231b3a4d"/><\/svg>')}.f_branding_on.blog-group-deadspin .editor-inner.post-content .pu


  Reply With Quote
The Following 2 Users Say Thank You to Ecky For This Useful Post:
aerohead (08-12-2017), freebeard (08-11-2017)