Was thinking about your .049 experiments. Many many years ago, I got one of those foam 6 foot gliders sold at toy stores. I put an .049 on it with aileron and elevator servos. Fist attempt it would only go left. Taped rocks to the outer right wing until I could get it to go straight. Directing it required airspeed. Without airspeed it still went left. I had to throw it and keep the nose down. It was not very maneuverable. Raise the nose and slow the speed it goes left. On a fly by it was still very slow. I could reach out and grab the wing. I would give it full aileron. You would watch the ailerons move full deflection and it was still going straight. A turn would slowly ensue. It was certainly an exercise in aerodynamics and energy.

Fast forward to learning to fly full scale twin engine airplanes. There is a speed called Vmc which stands for Velocity Minimum Control. We fail one engine then slow the plane. There is a speed where the engine will roll the airplane and you cannot stop it with control input; just like the foam glider. Recovery requires pulling back throttle (to stop the engine rotational force) and lowering the nose to build speed adding throttle as you accelerate past Vmc.

Some time back, I was out on a trip. When I got back to the airport a motel nearby had a large smoke plume. A C-130 crew was training. The crew had failed 2 engines for training and the airplane rolled on it's back and nose dived into the parking lot taking out one side of the hotel. Some patrons were found burned in their tubs.