Orlando,
Here's the thing.....Manned aircraft have the right of way.....Period.
If you are flying your Phantom at a designated Drone airpark....and a Cessna comes to make an emergency landing (or even approaches) YOU the Phantom pilot must yield way. Never, ever the manned aircraft.
Doesn't matter who is "right or wrong".
Human lives trumps hobby flights every time.
This is the exact reason the FAA clearly says visual unaided Line of Sight MUST be maintained at all times.
I'm all for this hobby, but I would crash my Phantom without a second thought if it meant getting out of the way of a manned aircraft.
I fly fixed wings at a flying club in a rural area in the foothills of the Cascades outside of Seattle. We've had two manned aircraft make emergency landings at our field in the last few years. Of course we immediately ground our planes when we see them signal that they will be landing. One was a motorized paraglider who had engine problems. The other was a military Black Hawk Helicopter. He circled the field slowly coming lower until we realized he needed to land and we grounded our unmanned aircraft. Within a few minutes a second Black Hawk landed and we were all politely asked to leave the field and not return until both copters had left. They did some repairs (?) to the first Black Hawk which took several hours, then left.
The motorized paraglider said that they mark RC flying fields on their maps, because they make the perfect, safe emergency landing field.