What I really want to know is, will +Audi International use a battery or that cool flywheel hybrid system?
Upcoming Audi Hypercar Known as Scorpion, Will Receive R18-Derived Engine
Speculation is rife about Audi’s upcoming hypercar, which is being referred internally as Scorpion—and not R10 or R20 as has been previously speculated. A final decision on the name hasn’t been taken …
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Does a "flybrid" work for a road car, or does it require flat-out driving with lots of heavy braking?
It could work for a sports car. The advantage is that it's lighter than a battery and absorbs energy faster so even a small amount of braking will spin it up and then it can release the energy faster for extra acceleration.
Downside of flywheels is that all that kinetic energy is released catastrophically in the event of a crash, whereas batteries are much less likely to fail as dramatically. Worth the tradeoff for F1, maybe not so much for consumer cars.