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Old 09-24-2020, 05:09 PM   #3568 (permalink)
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best angle

Originally Posted by JulianEdgar View Post
Incorrect. The literature is actually all over the place for 'best angle for lowest drag' for a diffuser.

Of course, the angle is dependent upon the 'length' of the diffuser, as with a prismatic fastback rear slant angle.
From Carr's research, published in Hucho, and an SAE Paper from FIAT, both reported 2.8-degrees as the angle which delivered the drag minimum for the 'long' diffuser. The information is exactly accurate within the context of the source material. That was good enough for me. And a gentleman would allow for the context.
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Last edited by aerohead; 09-24-2020 at 05:12 PM.. Reason: add data
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