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Old 04-02-2012, 09:14 PM   #1 (permalink)
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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 ....ie 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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Old 04-02-2012, 10:04 PM   #2 (permalink)
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If the frontal area is 7 sq ft I would guess that the Cd is around 0.35 ???
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Old 04-02-2012, 10:10 PM   #3 (permalink)
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.35 ?! That would be remarkable especially with the side openings, I hope you are right . Even .5 would be spectacular on a bike .
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Old 04-05-2012, 12:41 AM   #4 (permalink)
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With some engineering and modelling work 0.2 may be possible.
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Old 04-05-2012, 02:12 AM   #5 (permalink)
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Quote:
Originally Posted by Grant-53 View Post
With some engineering and modelling work 0.2 may be possible.
Do you mean with side openings?
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Old 04-05-2012, 04:18 PM   #6 (permalink)
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Probably not. I am working on both styles. It is a hot topic what with side wind loads and egress issues. It depends on preventing flow separation at maximum width along the shoulder to hip line.

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