well look at windtunnel tests, mostly every plane, car, truch, train, boat, building, etc that they put in
there is a much scaled down version of whatever there testing. even today with computer sims
they still use the windtunnel. there not to concerned about air molicule sizes, and it produces
accurate results.

so if one is trying to fly something like a P-47 in a 1:72 scale, I wouldn't worry aboit it lol. this is
where weight is your friend to try and cut through air resistance, and not to get tossed around in
a 5mph wind. hope this makes sense.

I'm no areonuatical engineer though.. I just play one on the internet