To get good answers, really depends on the subject. Engine tuning, and reliable running is a tricky thing to solve on RCU. I always equated tuning an engine to tuning a guitar. There is a "feel" for it that has to be developed. This come from experience. And generally engine problems are more about setup than anything else. The last new guy at the field I helped that was having engine problems had a loose glow plug, and a hole in his fuel line from using needle nose to take the line on and off. Plus he was leaking around the needle, and then of course it was not tuned properly. You have to see these things to truly solve them. These issues may not get mentioned in here.

Now if I am wondering what a good engine choice is for a particular plane, or maybe I have questions on servo choice, those types of questions get solved quite cleanly in here.