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In aeronautics, the thickness-to-chord ratio, sometimes simply chord ratio or thickness ratio, compares the maximum vertical thickness of a wing to its chord. It is a key measure of the performance of a wing planform when it is operating at transonic speeds. regional narrowbody widebody double-deck

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  • Relació gruix-corda (ca)
  • Thickness-to-chord ratio (en)
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  • En aeronàutica, la relació gruix-corda és la ràtio entre el gruix vertical màxim d'una ala i la seva corda. És una mesura clau del rendiment d'una a . A velocitats properes a la velocitat del so, els efectes del principi de Bernoulli sobre les corbes de les ales i el fuselatge poden accelerar el flux local a velocitats supersòniques. L'ona de xoc resultant genera que fa que existeixi la barrera del so. La velocitat a la qual es formen aquests xocs, el Mach crític, és una funció de la curvatura. A fi de reduir la resistència per ones de xoc, les ales han de ser el menys corbes possibles tot oferint una sustentació adequada. (ca)
  • In aeronautics, the thickness-to-chord ratio, sometimes simply chord ratio or thickness ratio, compares the maximum vertical thickness of a wing to its chord. It is a key measure of the performance of a wing planform when it is operating at transonic speeds. regional narrowbody widebody double-deck (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Lockheed_XF-104.jpg
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  • En aeronàutica, la relació gruix-corda és la ràtio entre el gruix vertical màxim d'una ala i la seva corda. És una mesura clau del rendiment d'una a . A velocitats properes a la velocitat del so, els efectes del principi de Bernoulli sobre les corbes de les ales i el fuselatge poden accelerar el flux local a velocitats supersòniques. L'ona de xoc resultant genera que fa que existeixi la barrera del so. La velocitat a la qual es formen aquests xocs, el Mach crític, és una funció de la curvatura. A fi de reduir la resistència per ones de xoc, les ales han de ser el menys corbes possibles tot oferint una sustentació adequada. El resultat natural d'aquest requisit és un disseny alar prim i ample, amb una relació gruix-corda baixa. A velocitats més baixes, la és, en gran manera, una funció de la superfície total, cosa que fa desitjable una ala amb molt poca corda i, per tant, les altes relacions d'aspecte de les avionetes i els . Aquests dissenys tendeixen naturalment a tenir una relació gruix-corda alta. Així doncs, per dissenyar una aeronau que funcioni a una gran varietat de velocitats, com ara un avió de passatgers modern, cal trobar l'equilibri just entre aquestes necessitats concurrents. (ca)
  • In aeronautics, the thickness-to-chord ratio, sometimes simply chord ratio or thickness ratio, compares the maximum vertical thickness of a wing to its chord. It is a key measure of the performance of a wing planform when it is operating at transonic speeds. At speeds approaching the speed of sound, the effects of Bernoulli's principle over curves on the wing and fuselage can accelerate the local flow to supersonic speeds. This creates a shock wave that produces a powerful form of drag known as wave drag, and gives rise to the concept of the sound barrier. The speed at which these shocks first form, critical mach, is a function of the amount of curvature. In order to reduce wave drag, wings should have the minimum curvature possible while still generating the required amount of lift. So, the main reason for decreasing the blade section thickness to chord ratio is to delay the compressibility effect related to higher Mach numbers, delaying the onset of a shock wave formation. The natural outcome of this requirement is a wing design that is thin and wide, which has a low thickness-to-chord ratio. At lower speeds, undesirable parasitic drag is largely a function of the total surface area, which suggests using a wing with minimum chord, leading to the high aspect ratios seen on light aircraft and regional airliners. Such designs naturally have high thickness-to-chord ratios. Designing an aircraft that operates across a wide range of speeds, like a modern airliner, requires these competing needs to be carefully balanced for every aircraft design. Swept wings are a practical outcome of the desire to have a low thickness-to-chord ratio at high speeds and a lower one at lower speeds during takeoff and landing. The sweep stretches the chord as seen by the airflow, while still keeping the wetted area of the wing to a minimum. For practical reasons, wings tend to be thickest at the root, where they meet the fuselage. For this reason, it is common for wings to taper their chord towards the tips, keeping the thickness-to-chord ratio close to constant, this also reduces induced drag at lower speeds. The crescent wing is another solution to the design to keep a relatively constant thickness-to-chord ratio. regional narrowbody widebody double-deck (en)
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