Simply put, I've taken a leaf out of the Star Wars book for this. Essentially, if you move the VTOL up, the wings move to form a "star" or "X" shape. Move it all the way down however, and you'll likely explode! Note how it says "prototype" in the title; its a proof of concept and while it flies, it does have a tendency to roll to one side randomly, although it's not too noticeable unless you're flying quickly. It's not a problem I've encountered before, so I'm going to assume it's to do with the motor configuration rather than the actual airframe/wings. That said, I'll build a new one from scratch and see if the problems persist. That will be the next upload. Until then, happy flying!