I have seen dozens and dozens of RC models spiral in when the pilot loses their orientation which is similar to a pilot flying into clouds and not being able to follow instruments to fly safely out. A little trick for the RC'ers I will offer now. As long as the airplane is well trimmed, just release the controls to neutral, then just apply up elevator so that the model starts looping. With any reasonable starting altitude the plane will pretty much stay in one portion of the sky, though during the loops slowly lose altitude. What it does is give you time to find someone to assist in the recovery. I flew a 150 mph quickie through the sun a couple of winters ago, and while it took about a minute for someone with young eyes to locate it, he managed to see it, get oriented and land it after killing the engine.