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Old 04-02-2012, 09:14 PM   #1 (permalink)
Master EcoModder
Join Date: Aug 2011
Location: East coast of Australia
Posts: 393

Yella Peril - '80 Mercedes 240D sedan
Thanks: 15
Thanked 41 Times in 17 Posts
What is the best road useful cd?

Using the calculator this forum kindly provides and working through various fairing shapes and real world testing is interesting .
For instance this Royal Enfield Dreamliner from 1953 that I've posted before works out at a cd of .66 from the published speed and fuel consumption figures .

Not a bad figure for something built primarily as a weather protection shield with some consideration of drag . When we come to something like Craig Vetter's fairing though things have really improved !

At the moment it seems Mr Vetter's fairing is about as good as it is possible to get bearing in mind the problems with a perfect NACA foil side lift in traffic and disturbed air . The openings at the sides seem sufficient to spoil the side lift but still provide a good airflow .

Does anyone know the cd of the Vetter fairing ?

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