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Hi sorry if this has been asked before.... Many thanks dave
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Like always, no information to inform the response. My Superbeetle and my Dasher have completely different architectures under the nose.
In general, you would need to establish the stagnation point and decide [if] to move it up or down. This establishes whether the air goes around or over the car. Then decide how much downforce you can afford or need. This will establish the profile of the bumper/airdam. A protruding lip aka splitter will gain downforce without adding drag
AFAIK.
If the airdam protrudes below the bellypan it will form a
vena contracta that constricts the flow.* aerohead reports that the guy at Darko wind tunnel suggests a softer, rounded lip. This would form a converging duct, a much better situation.
*[citation needed]