OCR Text |
Show Aviation Aviation's Aviations A viation's viations ' Future FutureLinked FutureLinked Linked With Tiny TinyInvisible TinyInvisible Invisible Air FilmNew Film FilmNew New YorkThe York -The The - The future o olaviation aVIatIon is linked with Wlth an mvIsIble invisible in invisible visible f film m of air 3lr only a few fewhundredths fewhundredths fewhundredths hundredths of an inch tluck thick tluckSo thickSo thickSo So nearly perfect is the thestreamhnmg thestreamlining thestreamlining streamhnmg streamlining of modern air- air airplanes airplanes air airplanes - planes that even the protrud protrud- protrudmg protruding protruding - ing mg heads of tiny tmy rivets can cancut cancut cancut the thespeed thespeed thespeed cut miles nules an hour from speed of a plane and greatly greatlylower greatlylower greatlylower lower its flight performance performanceThe The crucial air all ' film is known as asthe asthe asthe the laminar lammar boundary layer between betweenthe betweenthe betweenthe the all air airthrough airthrough ' the wing wmg of a plane and through which it flies It If the air airpasses airpasses airpasses passes smoothly over the v . 'wing wing sing ' mg all allis allis allIs is welL If the air becomes bel.omes belomes . turbu turbulent turbulent turbulent lent air resistance is increased and andspeed andspeed andspeed speed and climbing cUrnbmg ab ability lty are decreased decreased de decreased creased creasedGreat Great advances in knowledge of ofthe ofthe olthe the behavior of this invisible air airboundary airboundary airboundary boundary have been made possble possible possbleby possibleby possibleby [ by studies in wind wmd tunnels But now nowit nowit nowit it is becoming apparent that the day daymay daymay daymay may be approaching approachmg when wind wmd tun tunnel tunnil tunnel nel nil tests alone will not be the last lastI lastv lastword lastvord v . word ord in m aeronautical aeronautJcal researchFree research researchFree I Free Fbg-bt Fbg bt Fl1gM Flight - Study Stady NeededSpeaking NeededSpeaking Needed NeededSpeaking Speaking at the first WrIght WrIghtBrothers WrightBrothers WrightBrothers Brothers Lecture of the Institute Instituteof Instituteot ot of Aeronatutieal Aeronatutlcal Aeronatutical Sciences here the theBrItish theBritish theBritish BrItish air all ' expert , . , Prof B MelvIlle MelvIlleJones MelvilleJones MelvilleJones Jones of Cambridge universIty universItypomted universitypointed universitypointed pomted pointed out that free flight filght study of ofreal ofreal ofreal real airplanes all'planes allplanes ' may soon supply the thefinal thefinal thefinal final check on researchFlIght researchFlight research researchFlight Flight in smooth air tree free from fromsmall fromsmall fromsmall small scale turbulence turbulefice is needed he hemdIcated heindicated heindicated mdIcated indicated to disclose some of the theparasl theparasitic theparasitic parasl parasitic c air friction trIction losses now be bemg being being mg ing studied studled A slight unsteadmess unsteadiness unsteadmessmay unsteadinessmay unsteadinessmay may persist In wind wmd tunnels whIch whIchproduces whichproduces whichproduces produces effects eftects differing d1ffermg from fromthose fromthose fromthose those of actual fughtKey flightKey flight fught flightKey Key point pomt of ot investigations mvestlgatIons is a astudy astudy astudy study ot of the so called transItIon transItIonpomt transitionpoint transitionpoint pomt point where the smooth Iammar laminar Iammarflow laminarflow laminarflow flow of air turns into mto the turbulent turbulentpattern turbulentpattern pattern that robs planes of ot theIr theIrperformance theirperformance theirperformance performance The transition pomt point pomtshould pointshould pointshould should occur as far back on the thewmg thewing thewing wmg wing away from the leading leadmg edge edgeas edgeas edgeas as is possible In tree free flight fught tests testsProfessor testsProfessor testsProfessor Professor Jones disclosed a tbm thin tbmlayer thinlayer thinlayer layer of tinfoil only one fi\ fi file fie five \ e hun hundredtbs hundredths himdredths dredtbs dredths of an inch mch thick was suf sufficient sufficient sufficient ficient to shift slllft shaft the transition pomt point pomttor pointforward pointforward tor\\ tor torard forward \ ard and andjproduce produce drag |