What "black technologies" have people done to reduce weight and wind resistance?

People have made a lot of efforts and attempts to lighten cars or reduce wind resistance, which has spawned many "black technologies". So what are they?

Plastic motor? Just recently, the Hof Institute of Chemical Technology (ICT) and the Karlsruhe Institute of Technology (KIT) in Flawn recently put forward a proposal to replace the metal shell of the motor with plastic, so as to reduce the weight of the electric vehicle by reducing the weight of the motor. According to their proposal, rectangular heat dissipation ducts are selected around the stator to achieve more efficient heat dissipation, and similar design is adopted on the rotor, so that 80% or even higher proportion of 10% heat is taken away to reduce the influence of heat on the shell. Now, as long as it is proved by practice that the plastic motor can reach the same strength and working condition as the metal shell, maybe in the near future, we can see the plastic motor installed on the production model.

Virtual rearview mirror? The appearance of virtual rearview mirror is mainly to solve three problems: reducing wind resistance, providing interface for automatic driving and improving the line of sight of traditional rearview mirror. First of all, the problem of wind resistance. The traditional exterior rearview mirror generally accounts for 2 ~3% of the wind resistance of the whole vehicle, while the virtual rearview mirror can be reduced by 0. 1% or even more than the traditional rearview mirror because it only needs to install a wide-angle camera outside. The second is to improve sight. I believe that everyone has encountered the problem of poor vision in the rearview mirror when driving under bad conditions such as overnight or heavy rain, heavy snow and fog. Virtual rearview mirror can solve the problem of insufficient light by actively adjusting brightness. At the same time, because of the camera, there will be no rain and snow dripping.

Resin/carbon fiber/bonding technology? Perhaps many people will think that the plastic motor mentioned at the beginning is a joke or a fantasy. But in fact, from the initial cast iron to the current aluminum alloy; From the original steel to the current carbon fiber; * * * A whole piece of complete metal bracket is used to steal the space full of holes.

Hide the doorknob? The appearance of concealed door handle undoubtedly reduces the wind resistance, but the actual reduction depends on the specific situation.