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NeilBlanchard · 11-07-2011, 08:10 PM

You cannot slope the underside up as steeply as you slope the top and the sides. The reason is, the ground slows the air flow back in, and so you would create a low pressure wake. The underside has to be kept flatter so this doesn't happen.

Here's the template that includes the curve on the underside:

11-07-2011, 08:10 PM	#3 (permalink)
NeilBlanchard Master EcoModder Join Date: May 2008 Location: Maynard, MA Eaarth Posts: 7,907 Mica Blue - '05 Scion xA RS 2.0 Team Toyota 90 day: 42.48 mpg (US) Forest - '15 Nissan Leaf S Team Nissan 90 day: 156.46 mpg (US) Number 7 - '15 VW e-Golf SEL TEAM VW AUDI Group 90 day: 155.81 mpg (US) Thanks: 3,475 Thanked 2,950 Times in 1,844 Posts	You cannot slope the underside up as steeply as you slope the top and the sides. The reason is, the ground slows the air flow back in, and so you would create a low pressure wake. The underside has to be kept flatter so this doesn't happen. Here's the template that includes the curve on the underside: __________________ Sincerely, Neil http://neilblanchard.blogspot.com/ Last edited by NeilBlanchard; 11-07-2011 at 08:17 PM..