I assume (I hate it when I do that) that the flapping wingtips on the full scale aircraft will not be moving about so much in calm conditions those shown on the model. They look kinda useless on the model, but I'm sure that further arithmetic will be done so that the tips only "flap" when encountering certain g-loads/aerodynamic forces. If these "flapping" tips provide any significant lift at all, they will involve some (significant?) fore-and-aft shifts of the center of lift (swept wing planform). As far as I know, the wings of all modern transport category aircraft flex ("flap") to a certain degree.
Anyway, an interesting concept and a very cool model. Oh my, what am I saying? It's a drone being flown in close proximity to an airport! Where's a dronecop when one is needed?
Cheers,
Grog