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Old 04-18-2015, 03:11 PM   #5 (permalink)
aerohead
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best

Quote:
Originally Posted by slipknotsv View Post
It is best CURVED LINE
I'm not sure that it's the best,but it would be low risk to anyone considering aft-body streamlining.
Here are a few which Rolf Buchheim and his associates tested at 1/5-scale at Volkswagen,including their plan-view,along with their coefficients of aerodynamic drag.
The 1922 Wolfgang Klemperer body

The 1981 'Drop' body

The 1981 'Blunt' body

The 1981 'Flow' body (truncated tail)

The 1981 'Flow' body (full body)

They also tested the 1937 AVA G'o'ttengen Schl'o'r pilbug car
@ 1/5-scale it was Cd 0.15 with a smooth belly
@ 1:1 scale it was Cd 0.158 with a smooth belly
@ 1:1 scale it was Cd 0.186 with a 'standard' underbody

I don't have its plan-view scanned yet.Sorry.
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With 'features' drag,all the models would have a little higher drag (0.008 in the case of the Pilbug car).
*Adding mirrors might add in the range of 0.015 (as with the Ford FUSION LSR car).
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