Reynolds number
Ok, I think I understood your point.
Referring to the formula and assuming the same weather condition (the same density/viscosity) the Re will increase as the airspeed and/or chord increases. There is no reference to the airfoil type, however different airfoils may produce different airspeeds at the same motor thrust…
So, one may say that the higher the Re number is, the better aerodynamics characteristics we get?
Cheers,