Major,
I enjoyed reading the thread, it was/is good food for thought…

I gathered several things from reading the thread

(1) the aircraft in that thread suffered from not have enough design control at MFR to fly one engine
(2) Experience, experience experience
(3) Things do not always scale from the big boys down to RC scale

*****My experience on a single engine****
I quickly & instinctively gathered I had a problem when I lost a motor, I knew I had to keep the wings as level as I could to land.
The reality/sick feeling was I was not going to make it back to the field, I cut my losses and landed it. The landing gear suffered the brunt of the crash/hard landing but other than that all went well.
It was instinctive to turn in the correct direction; the aircraft would not turn in the other direction (design flaw of my doing).
If I had the design info Ed Moorman gave me (8 degrees out) a few years ago when I played with a twin I would have been in fat city


I think the Germans & Ed Moorman have it right, design in stability & control or test the design prior to sinking a ton of cash into something that will be doomed on one motor