[cyrieln]

Low weight and high aerodynamic efficiency are crucial. You naturally end up with high aspect-ratio wings which tend to be more flexible than conventional aircraft wings. In order to keep aero-elastic effects under control, multiple tailplanes can help to stabilize the structure, and provide roll control at the same time - we’re not set on this technology though, ultimately our analysis tooling will drive this design decision.

Batteries are heavy, but if you want to conduct long endurance flights - greater than a few days, then realistically they are the best option.