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My understanding is apart from allowing gases to escape,another function of slots, grooves or holes in a rotor is to allow a scraping clean of the deposits which can be embedded on the rotor surface when the gases which may not escape reconstitute back to a deposit on the rotor,in an irregular pattern which then builds on itself and leads to a mistaken diagnosis of warped rotor,as well as inhibiting braking function.
Apart from that the other truisms are centrifugal force is best not fought against so let the waste gases,debris whatever go outwards and ,with gravity downwards,and with airflow backwards,and make ducting help this.
Anyone got clues on little "scrapers" that treat the rotor ?
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