View Single Post
Old 07-03-2008, 03:42 PM   This thread is in the EcoModder Project Library | #1 (permalink)
Batman Junior
MetroMPG's Avatar
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,459

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

MPGiata - '90 Mazda Miata
90 day: 55.97 mpg (US)

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

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 67.41 mpg (US)
Thanks: 3,997
Thanked 6,889 Times in 3,574 Posts
Project: making a permanent Metro Kammback extension

I've started on version 2 - the permanent version of my earlier, cruder, Kardboard Kammback:

See: Kardboard Kammback: testing a partial boat tail prototype

Following in ebacherville's footsteps, and encouraged by a conversation with Phil, I'm going to try foam core construction, based on a cardboard mockup/base.

The mockup will be tuft tested first, to make sure it works. The main difference from version 1.0 will be generously radiused "shoulders" in the transition from the roof to the side of the car - to ensure more gradual pressure recovery and discourage vortex formation.

Here's where I'm at so far:

(forming compound curves is harder in cardboard than it will be in foam!)

Attached Thumbnails
Click image for larger version

Name:	kardboard-mockup-profile.jpg
Views:	16262
Size:	78.6 KB
ID:	1079   Click image for larger version

Name:	kardboard-mockup-rear-3-4.jpg
Views:	16220
Size:	76.5 KB
ID:	1080   Click image for larger version

Name:	kardboard-mockup-rear.jpg
Views:	16173
Size:	45.4 KB
ID:	1081   Click image for larger version

Name:	kardboard-mockup-rear-detai.jpg
Views:	16129
Size:	39.9 KB
ID:	1082  
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

has launched a forum for the efficient new Mitsubishi Mirage - fuel efficiency info for Geo Metro owners - electric car conversion on a beer budget
  Reply With Quote
The Following 4 Users Say Thank You to MetroMPG For This Useful Post:
drossdarkblood (05-26-2010), HyperMileQC (12-04-2012), Piwoslaw (04-25-2011), theoteacher (09-25-2010)