I have a cisco flip, with a new set of batteries it will easily record a full hours video. a lot depends on how much you want to pay, a friend has a drone with one of the hero cameras, he has a remote screen to get the 'drones eye' view, but he has invested a lot of money into the system. a cheap and simple system could be an old camera phone mounted in the model, set running recording to memory card, recording time would be dependent on the memory card capacity.
Grendel