Quote:
Originally Posted by aerostealth
I was watching TFL Trucks last night and they were testing a Rivian electric truck towing a flat bed trailer with a large pickup truck on the carrier up to the Ike Gap (from Boulder, CO) and back. I won't post a link here because these guys are seriously aero-ignorant but they had a result I found interesting.
Going downgrade and setting their cruise control to 60 mph they only gained a couple kWh and a few miles of range from the regenerative braking. They were very puzzled by this result. The following occurred to me.
1: Regenerative braking energy returns at speed is a function of aerodynamic drag and rolling resistance.
2: A lower drag shape with all the same parameters (frontal area and mass) would allow more regenerative braking energy returns.
3: That it should be possible to map and graph the potential for regenerative braking energy returns as a function of CDA, mass, and speed.
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A) And they're apt to do 75-mph 'climbing' while not allowing the downhill at 75-mph, cutting the kinetic energy in so doing, and skewing the regeneration quanta downwards.
B) To the the point, the aerodynamic abominations rob extremely valuable available wheel power, which could otherwise be harvested, returning 81% back to the battery ( please see Dave Hermance, Executive Engineer, Hybrids, Toyota Motor Company ).
C) When the object is to present a derisive presentation about BEVs, it's incumbent upon the practitioner to construct an 'experiment' designed to amplify the shortcomings of their target, while hoping that no one in the audience is astute enough to see past the deception.