Quote:
Originally Posted by aerohead
There's been a bit published about airdams since 1960, when Chevrolet Division of General Motors introduced it to the motoring public.
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There's been some published on air dam research, yes. The most recent article I have was published by Ford engineers in 2018, testing air dam depth and curvature on the 2015 F-150.
Nowhere in the literature, however, does the rule "air dams should extend as low as the lowest-hanging component under the car and no lower" appear (that I've read, anyway). The Ford paper points out that drag reduction depends on the pressure on the backside of the tailgate--which changes with air dam shape and size and cooling air inlet shape, size, and flow rate! It's tremendously more complicated than the "rule of thumb."