Quote:
Originally Posted by jimchitas
i belive they have affect in other forces maybe is small or even big but still i wonder can they make downforce or just lift or they just decrease drag (which wil be ideal for future projects) lets hope my research will be accurate with numbers
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We can't rule out the possibility for lift/downforce, but if it did occur, it might be only within the context of cleaner flow created, which might enhance the performance of an airdam, or rear diffuser, both clearly associated with spoiling lift, specially in high-performance sports cars.
Otherwise, longitudinal attached airflow, traveling along the sides of a vehicle, would possess no shearing vector capable of acting vertically, into the turbulent boundary-layer adjoining a vertical surface ( skirt ). Pressure could not impart a lifting force against a vertical surface. Only a yaw moment or negative roll moment.
For a typical passenger vehicle, and at normal, posted speed limits, 'lift' isn't considered to be something we'd obsess over.