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Old 02-18-2015, 07:32 PM   #9 (permalink)
aerohead
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Insight

Quote:
Originally Posted by Xist View Post
I saw a recent post on here challenging the original Insight's Cd, according to someone's windtunnel testing. With all of those aerodynamic features, supposedly it is really not that aerodynamic?

Really?
John Boniface of GM claims that their Warren Michigan tunnel indicated Cd 0.30 for Insight-I.If this is an SAE crosswind-averaged Cd,then Honda's zero-yaw Cd 0.25 ,may still be valid.GM doesn't provide the context.
A2 Wind tunnel claims same Cd 0.30.This tunnel is incapable of measuring anything but zero-yaw due to its narrow test section.
And while GM and A2 report identical Cds for say the Tesla S,they come up with different Cds for other cars.
And up to a point,all GM Cds have been down-graded.(Sunraycer went from Cd 0.125,to Cd 0.143,for a 14.4% discrepancy).That would make Insight Cd 0.285 right there!).
Hucho,in 1985 indicated higher than reported drag for Honda products measured in VW's climatic tunnel,but the numbers were closer to the standard deviation of earlier tunnel comparisons with the JARI wind tunnel results.
We may want to wait for other 'naked' cars to be tested at A2,and see if the same trend line exists.
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Last edited by aerohead; 02-18-2015 at 07:34 PM.. Reason: spelling
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