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Old 01-12-2021, 03:35 PM   #11 (permalink)
JulianEdgar
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Quote:
Originally Posted by AeroMcAeroFace View Post
Cd and Julian, I think this paper may be relevant to the side fins.

https://www.researchgate.net/publica...dy_using_flaps
Wow, what a paper - on spoiler design on hatchbacks as well as side fins.

It's also the first paper I've seen that supports what I have measured on the road - that fins on a fastback measurably reduce drag. (And another piece of supporting evidence for throttle stop testing.)

The drag reduction they quote on the Ahmed body by the use of the side fins is much higher than I measured on my Insight, but put my measurements together with theirs and I am pretty confident in saying that, at minimum, people should test fins if they have a fastback shaped car.

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