Quote:
Originally Posted by elsp
this is a nice site with drawings in .DWG file
ww.davincitechnologies.com/AirfoilOptimizerStdAirfoils.htm
(add a "w" in front)
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Bear in mind that airfoils are designed for flight.Abbott and von Doenhoff warn,in their Theory of Wing Sections that if a wing is used outside the context for which it is created,then none of its performance criteria have any validity.
Wings are designed for laminar environments far beyond ground effect.They have zero profile drag and are governed by skin friction.
In an automotive environment all the air is turbulent,you are emersed in ground effect,skin friction plays only an insignificant role,and the greatest challenge is moving the point of separation as far back as possible,which is achievable only with the longer,gently tapering tail as depicted in the streamlining template.If you make it longer,drag goes back up do to increased skin friction.
You might want to look at W.A.Mair's work on boat tails.This is what works with motor vehicles.Leave that wing stuff for the 'upper' sky.