Use your words?
Such things are usually for agricultural equipment
www.freepatentsonline.com/6248145: Cleaner for rotating air-intake filter -- United States Patent 6248145
Is it an active grille block?
Can a brake rotor be an aerodynamic oddity?
Massive [pun] weight reduction and better cooling
Quote:
A typical brake rotor for this car about 32 pounds. This rotor 12
pounds. Significant weight savings that translates to
greater acceleration, and greater fuel economy. These
lattices are dramatically more effective at heat transfer. The
heat transfer ability of this rotor is five times a typical
rotor. Less surface area means less brake dust accumulation 95%
less and because of the material which we'll talk about, this
won't rust.
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Those are not rookie numbers. By tuning the particle size of the ceramic and aluminum powders they engineer the grain structure to be isotropic.