The Mercedes-Benz EQXX is so efficient that it can serve as a benchmark for all vehicle designers to aim for.
A recent video at the Engineering Explained YouTube channel tells us about a vehicle that just might give Tesla and the other EV manufacturers a serious run for their money. Is it the fastest EV ever built? No. But, its efficiency is extremely impressive.
The other way to add more range is to use less energy. But, getting to something like 600-1000 miles requires you to make serious compromises, like you see with the upcoming Aptera. It’s efficient, but it only has two seats and the shape is a bit avant-garde for most people. But, on this graph, there’s a “floor” of rolling resistance. At speeds high enough to drown out the vehicle’s electronics draw but still too low to have much aerodynamic resistance, the main force you’re moving against is the resistance of the tires, which is affected not only by tire design, but vehicle weight .
The drag coefficient acts like a multiplier for the frontal area. A car with a 0.5 drag coefficient acts as if it was half the size. A drag coefficient with .2 is like having a vehicle 1/5 the size, etc. To get a lower drag coefficient, you need an efficient shape, which is somethingThe simplest way to understand efficient shapes without involving too much math is to compare the shape of the vehicle to a teardrop or airfoil shape, which is about the most ideal shape possible for low drag.
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