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Originally Posted by phoenix
The fins can be parallel - as the 7 degree diverging angle of the 'ceiling' of the diffuser is what creates the low pressure.
The fins themselves can be angled if you wish, but again 7 degrees should be the maximum angle. Any greater and the air flow is likely to become detached from the fins which will cause turbulence and loss of downforce.
The angled inner fins seen in pictures are usually to tidy up the flow round the gearbox, which commonly intrudes into diffuser space. Outer fins are usually parallel and without a wind tunnel to see what is going on with the airflow if you angle them I would stick with parallel to be sure of not introducing some undesirable turbulence.
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Thanks! Now here is my question- if the fins are angled apart, but the outside ones are parallel, then the "channels" between the outer fins and the next ones in would have the opposite effect as the inner ones... ?
Do you see what I mean? If you set it up that way, there is an X degree difference between the inner fins, and then the parallel outer fins create a -X degree difference.
In this example, it looks like there are no parallel outer fins, but they are all angled. But I can't tell for sure.
Thanks for your help with all of this!