multicopter

can you build a multicopter with tilt motor mounts on all arms? has anyone done this? if so please post details bellow as i am very intrigued, also if you did this could you make the arms like helicopter blades (but without the aerofoil) and have a constant throttle setting and control altitude...

Has anyone tried to extend the flight time of multicopters by supplementing lift with an aerostat. An aerostat is a helium or hydrogen filled blimp. It would be important that the shape is streamlined like a blimp for better wind penetration. It wouldn't be fast or aerobatic but it might extend...