NACA Style Duct

*UPDATE* 27 August, 2017
If you are looking for the version of this to fit a Mini Talon hatch, please go to my Wiki parts page:
http://www.itsqv.com/QVM/index.php?title=Mini_Talon_Parts_Compilation

*UPDATE* 4 August, 2017
I added two versions of these that fit a slightly curved surface in the event your model surface isn't flat.

*More versions found*
I did find two more versions of RC NACA ducts here on Thingiverse:
https://www.thingiverse.com/thing:1854774
https://www.thingiverse.com/thing:455438

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I designed these to emulate the NACA ducts you see on aircraft which are designed to collect large quantities of air without creating too much drag. I did not optimize them using any CFD methods for their sizes but they were designed to the Nasa/Naca design guide.

I use them anywhere I feel an extra bit of cooling air might help. The included picture is the 32mm (width) version on the hatch of my Mini Talon.