Earlier in this thread I mentioned a NASA fan blade which is vented, and blows air over certain areas to reduce sound (turbulence).
Here is the link:
Engineering and Fabrication Techniques for Low-Noise-Research Fan Blades
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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