"B A R R Y" wrote

True scale r/c models often suffer from serious controllability issues in
ugly attitudes.

This is why r/c pilots are often encouraged to gain serious experience
before moving to true scale warbirds, just like full-size!

Another factor that has not been brought up, is how weight versus wing area,
and HP to weight ratios of models versus full sized aircraft.

Also, the effect of the air is different at scale sizes, which is related
through Reynolds numbers.

Thrust at model sizes is very easy to get way up over the total weight of
the model. Not so easy with full scale.

There is a rule among model builders, but I can't for the life of me
remember what it is named, or exactly the numerical relationship.

Something like "rule of square" or "rule of cube" or "rule of quad" or
something like that. Basically, as I recall, it is that as size double, the
wing area (or weight) is 4 times as much.

I never got into that type of thing, since I am not into the whole accurate
scale model stuff. As long as it is fun to fly, I'm happy. g
--
Jim in NC