Well, I actually used it a few time. Good in real scale, interesting compared to MSFS but of NO USE at all for serious R/C models. The reason ist quite simple. As bluesky pointed out, aerodynamics are pretty different. Xplane is made for heavy stuff AND for cockpit view. In aerodynamics, unfortunately 1000 devided by 100 doesn't compare to 100 devided by 10. We call it the "secret of the smallest number".

Xplane just scaled down their trainer - they are not using a seperate calculation model. Some did that in the early 90th and failed resp. redesigned their program entirely. Xplane can irgnore about 20 aerodynamic equations or at least consider them with fairly large umbers or even pattern of constants - but these 20 equations make the difference to the sudden jumps, to elevation/aileron response and the way the 300% overpowered propeller drives the wind against giant (if scaled) elevators etc.

There is one more difference: real aicrafts are designed to carry man. If they fail, somebody dies. Failure is our daily biz in RC modelling (...unfortunately), we fail in steering, we fail in constructionor building so what we fly is cutting edge technology in any respect. Xplane as much as MSFS is designed for the normal, safty redundant stuff - they have no idea of what we rc folks do with a trainer 40.

Walter Extra is a pretty tough guy if it comes to aerobatics. I wonder how green his face would look like if he steps out of a regular aerobatic trainer in the hands of an average pilot R/C pilot.

Nice toy to learn the real stuff but unsuitable for serious R/C.