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Old 11-26-2019, 11:04 PM   #4 (permalink)
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Originally Posted by freebeard View Post
[IMG]The bell shape accelerates the underbody flow irrespective of how smoothened it might be.
The bell shape (which I'm not seeing; the plates look parallel to me, considering that the rear body tapers inward after the wheels on a C4), along with the upward slope under the body, forms a divergent duct with the ground--which will decelerate airflow, not accelerate it (Flow continuity principle at work, and exactly the opposite of what air curtain ducts do. There, the ducts are convergent, which accelerates the flow into a fast-moving sheet of air across the wheel opening).

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