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Cd · 02-10-2015, 08:18 PM

" In 1969,R.G.S.White,at MIRA,commented that Cd 0.25 could be achieved with virtually all contemporary shapes. "

And here are the two cars I mentioned earlier - and both are at Cd 0.25 .
This is a good visual example of what you mentioned Phil.

I got to thinking about something related to these two cars. Toyota ( Lexus ) gives a quote of .25 for the Lexus LS 430 when it had the optional air suspension.
Honda gave a Cd of .25 for the Gen 1 Insight.
Recently, as we have seen, the Insight has been degraded to a .30 when tested in a different tunnel.
In this same tunnel, a Gen 3 Prius was tested at .26 - so only one count off of the factory figure.
If Toyota tested the Lexus LS 430 in the same tunnel as the Prius, then that would mean it has a Cd of .26 versus .30 for the Insight.

So the LS 430 could be four counts better than the Insight !

Thats a lot of freedom for designers between the two shapes.

02-10-2015, 08:18 PM	#20 (permalink)
Cd Ultimate Fail Join Date: Feb 2008 Location: Austin,Texas Posts: 3,585 Thanks: 2,872 Thanked 1,121 Times in 679 Posts	" In 1969,R.G.S.White,at MIRA,commented that Cd 0.25 could be achieved with virtually all contemporary shapes. " And here are the two cars I mentioned earlier - and both are at Cd 0.25 . This is a good visual example of what you mentioned Phil. I got to thinking about something related to these two cars. Toyota ( Lexus ) gives a quote of .25 for the Lexus LS 430 when it had the optional air suspension. Honda gave a Cd of .25 for the Gen 1 Insight. Recently, as we have seen, the Insight has been degraded to a .30 when tested in a different tunnel. In this same tunnel, a Gen 3 Prius was tested at .26 - so only one count off of the factory figure. If Toyota tested the Lexus LS 430 in the same tunnel as the Prius, then that would mean it has a Cd of .26 versus .30 for the Insight. So the LS 430 could be four counts better than the Insight ! Thats a lot of freedom for designers between the two shapes.