**3.7 Lilium**

Ducted Electric Vectored Thrust (DEVT) is a proprietary technology from Lilium Jet, which incorporates electric jet engines into the wing flaps for thrust vectoring. This provides advantages in payload, aerodynamic efficiency, and a lower noise profile. Each of the 36 individually controllable flaps in the propulsion system has a ducted electric fan and serves as a lifting and control surface. On the canard and main wing, the 36 ducted fans are embedded in a 1:2 ratio. The ducted fans are incorporated into the wings, reducing weight, and minimizing aerodynamic drag loss by eliminating the need for separate nacelles.

Because the discharge capacity of the batteries did not provide sufficient power at lower levels of the SOC, the battery used permitted a minimum SOC of approximately 30–40%. Modern cell technology employs more advanced anode materials, such as silicon, to increase the battery cell's discharge capacity and, as a result, significantly improves power provision at low SOC. A minimum SOC of 10–15% is enabled for the Lilium Jet, which has seven seats.

Over the years, the performance of the development of battery cells has rapidly improved, and they are now available with energy densities of more than 300 Wh/kg and power densities of more than 3 kW/kg. This helps with the design of a battery system with more than 300 kWh of total stored energy, to achieve a maximum physical range of 250 or more kilometers, including reserves (**Figure 10**).
