 transit studi skin friction measur insul flat plate mach number 5 8 transit studi skin friction measur insul flat plate mach number 5 8 investig transit skin friction insul flat plate 5 26 galcit 5 5 hyperson wind tunnel nomin mach number 5 8 phosphoresc lacquer techniqu transit detect good agreement total-head rake measur plate surfac pitot boundari- layer survei boundari layer laminar reynold number 5 10 transvers contamin caus turbul boundari layer tunnel sidewal origin downstream flat plate lead edg reynold number 1 5 2 10 spread uniform angl 5 compar 9 degre low-speed flow two-dimension local disturb investig techniqu air inject boundari layer hasten transit extens onset transit occur reynold number low 10 fulli develop turbul boundari layer reynold number 2 10 amount air inject qualit discuss emphasi possibl greater stabil laminar boundari layer hyperson flow lower speed direct skin-friction measur float element techniqu rang reynold number verifi laminar complet rang air inject turbul shear reynold number greater 2 10 good agreement earlier investig turbul skin-friction coeffici 0 40 incompress flow constant 0 46 effect reynold number 5 6 10 