AC Cars is displaying an electric city car concept with a lightweight magnesium frame at the Geneva motor show.
The prototype features a magnesium chassis frame with an integrated rollcage, and the whole structure weighs just 67kg.
Magnesium alloy extrusions form the main structure of the chassis, with corner node joints bonded to close the structure. AC says the chassis can be assembled "in minutes", and says the sections are self-jigging.
It is not certain that AC will build a production version of the car, but it is looking to sell its technology to other car makers.
“Our prototype magnesium chassis, initially for EV applications, is at the forefront of technology for which we own the rights and which can provide vehicle designers with the ultimate in low-weight potential,” said Alan Lubinsky, chairman of AC Cars.