title_body: Drones capable of smooth plane/bird-like flight
upvoted_answer: You might be able to write custom flight control software for a multi-copter that would simulate this. You might get close just by radically limiting the pitch and roll rates and being gentle on the throttle. In either case it wouldn't be intrinsic to the design.
  If you want smooth, soaring flight, you'd be best to build a fixed wing model with a fairly large wing span and low weight, similar to a soaring bird. A basic electric motor-glider like a Bixler is quite a popular FPV platform because they fly fairly slowly and smoothly, and are easy to fly (which is important when you're trying to make sense of the view through goggles).