Air would drag on the rotor at speed. A pump rack keeps a near-vacuum, and the pump is a serviced part.
Loïc Bastard, CTO · Investor webinar, 13 Aug
The full answer
At high speed, air around the rotor would act like a tornado and waste energy as drag. A pump rack removes the air, including a turbomolecular pump that reaches a very low pressure. The vacuum pump is one of the serviced parts with a scheduled replacement.
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