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Rotational inertia should be very small for a driveshaft. Especially the difference between a steel/alloy one vs. carbon, given that there is engine inertia, gears, flywheel, diff, axles, wheels and tires attached. Most of those with a higher radius than the shaft. IIRC, it goes like MR^2, so I'm not even sure why they bothered in the first place.
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