The other reason is for braking from what I understand, because when you brake, it can cause a spike to your ESC i believe, so when they run their spools and are braking lots, they need extra protection. Not sure if it actually increases braking power though...
You just watch... whenever you see a big event where the spools are in the cars, out come the shottky diodes (2004 IFMAR Worlds, 2006 TITC). Some of the Diode arrays soldered together at the 2004 worlds looked very funny.
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