Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - The *Ultimate* Aerodynamic Car? Dave Cloud's "Dolphin"

The Toecutter · 05-10-2010, 06:39 PM

Ask him what kind of tires he is using.

I highly doubt they aren't LRR tires at this time with a Crr of 0.010 or more. A 0.11 is about the theoretical Cd limit for a road-going 4-wheeled car, at least when you account for how the air interacts with moving parts. There are prototype cars that have scored less than that in a wind tunnel, but they were stationary. Put them in motion, and a 0.11 is about the limit.

Dave knows what he is doing. A 0.15 would not surprise me in the least, but a 0.11 is unlikely. The Ford Probe V has a 0.137 and Schlor car a 0.13, and they had extensive access to and modification resulting from wind tunnel results.

05-10-2010, 06:39 PM	#64 (permalink)
The Toecutter Master EcoModder Join Date: May 2010 Location: Ghettoville, USA Posts: 251 Rebellion - '16 KMX Framekit Custom electric velomobile Thanks: 149 Thanked 187 Times in 112 Posts	Ask him what kind of tires he is using. I highly doubt they aren't LRR tires at this time with a Crr of 0.010 or more. A 0.11 is about the theoretical Cd limit for a road-going 4-wheeled car, at least when you account for how the air interacts with moving parts. There are prototype cars that have scored less than that in a wind tunnel, but they were stationary. Put them in motion, and a 0.11 is about the limit. Dave knows what he is doing. A 0.15 would not surprise me in the least, but a 0.11 is unlikely. The Ford Probe V has a 0.137 and Schlor car a 0.13, and they had extensive access to and modification resulting from wind tunnel results.