01971oam 2200565 450 991071716210332120220210090328.0(CKB)5470000002528594(OCoLC)1156323793(EXLCZ)99547000000252859420200602d1939 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierWind-tunnel investigation of an N.A.C.A. 23021 airfoil with two arrangements of a 40-percent-chord slotted flap /by Frank DuschikWashington, [D.C.] :National Advisory Committee for Aeronautics,1939.1 online resource (11 pages, 11 unnumbered pages) illustrationsTechnical note / National Advisory Committee for Aeronautics ;No. 728"September 1939."No Federal Depository Library Program (FDLP) item number.Includes bibliographical references (page 10).AerofoilsSlotted flaps (Airplanes)Wind tunnel testingAerodynamicsAerodynamicsfastAerofoilsfastSlotted flaps (Airplanes)fastWind tunnel testingfastAerofoils.Slotted flaps (Airplanes)Wind tunnel testing.Aerodynamics.Aerodynamics.Aerofoils.Slotted flaps (Airplanes)Wind tunnel testing.Duschik Frank1393030United States.National Advisory Committee for Aeronautics,TRAALTRAALOCLCOOCLCFGPOBOOK9910717162103321Wind-tunnel investigation of an N.A.C.A. 23021 airfoil with two arrangements of a 40-percent-chord slotted flap3448628UNINA