Lenny was after a "layman" description of why larger models fly better than small models if the wing loading of each is the same.
Years ago, whilst teaching an adult class , I found that "layman" information must start from the layman's base of information -then work UP to the information being presented.
In this case - formulas and charts are a considerable step UP from a layman approach to grasping a concept.
My own answer to this question about Reynolds Numbers goes like this:
Air is a sea of unconnected , heavy molecules -all spaced evenly and of the same size.
When you move something thru it, the molecules must move out of the way.
If you try to move rapidly, some molecules get suddenly pressed more closely together, as they are pushed out of the way.
If you move slowly OR the moving object is very small, the molecules move, away or around , easily.
Coversely, big objects ,moving thru the air , trap the molecules more easily , as they can't quickly move around the object .
That creates uneven distribution of the molecules -which IS pressure difference - which is ( ta-da) LIFT.
The SIZE of the moving object , compared to the SIZE of the molecules of air, is the important point here.
So- size really matters-in this case.
Now add the speed of the moving object to it's size and you get part of a "formula" for figuring how that moving object will compress or disturb the air ( also part of the formula you call Reynolds Number ).
In our applications - we find that as the model gets smaller - it gets less efficient -at an alarming rate.
All because of it slips thru the sea of molecules more easily.