View Single Post
Old 02-22-2010, 02:33 PM   #129 (permalink)
MetroMPG
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,530

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 54.46 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car Mirage - '14 Mitsubishi Mirage ES (base)
90 day: 62.14 mpg (US)
Thanks: 4,078
Thanked 6,978 Times in 3,613 Posts
I was happy to see good attached flow too. I couldn't make out what was going on on the top by the top/side transition. Glad you saw nothing unusual.

Yeah - the upward flow on the side was what caught my attention too.



We saw evidence of the same thing in the Ford Ranger aero cap video.

Flow will travel from high to low pressure, and above the arc of the cap is lower than the sides, so that's what we're seeing. If the cap were tapered in plan as well as profile, those side tufts would probably be closer to horizontal. (You can see this in the tuft vid of my boat tail.)
Attached Thumbnails
Click image for larger version

Name:	fubecas-cap-tufts.jpg
Views:	595
Size:	21.6 KB
ID:	5668  
__________________
Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote