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PaleMelanesian · 03-30-2010, 05:03 PM

Ah! Here it is:

http://ecomodder.com/forum/showthrea...rt-c-9287.html

Length-to-height ratio of 2.5 for the back end. That calculates to about 24 degrees. (update: wrong - see below)

If you measure the angle from the rooftop to the trunk trailing edge of your car, it's likely a little steeper than that. You want it flatter, so make a lip that extends out the back a short distance.

Edit: Wrong information! Sorry!
That's 24 degrees between the top angle and bottom angle, but only 12 from horizontal to either one. 12 degrees is what you want at the back of your car.

03-30-2010, 05:03 PM	#5 (permalink)
PaleMelanesian Hypermiler Join Date: Dec 2007 Location: Texas Posts: 2,321 PaleCivic (retired) - '96 Honda Civic DX Sedan 90 day: 69.2 mpg (US) PaleFit - '09 Honda Fit Sport Team Honda Wagons 90 day: 44.06 mpg (US) Thanks: 611 Thanked 433 Times in 283 Posts	Ah! Here it is: http://ecomodder.com/forum/showthrea...rt-c-9287.html Length-to-height ratio of 2.5 for the back end. That calculates to about 24 degrees. (update: wrong - see below) If you measure the angle from the rooftop to the trunk trailing edge of your car, it's likely a little steeper than that. You want it flatter, so make a lip that extends out the back a short distance. Edit: Wrong information! Sorry! That's 24 degrees between the top angle and bottom angle, but only 12 from horizontal to either one. 12 degrees is what you want at the back of your car. __________________ 11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles Last edited by PaleMelanesian; 03-30-2010 at 05:20 PM..