[Piotrsko]

Reynolds number is mostly a speed where flows change. They were concerned with abrupt stalls on laminar flow airfoils and when the airfoil went laminar low drag. Nothing magical except the transition from turbulent to laminar and the equipment avaliable back then couldn't determine the point of the transition. Could be new stuff with computer analytics, dont care unless the surface is attempting to operate in That surface speed. Isn't useful for R/C gliders subsonic. I don't understand the mindless fixation on the transition point. Your either turbulent or not. The amateur definitely cant measure it