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椭圆形机翼 Aile elliptique Elliptical wing Ala el·líptica Ala ellittica Ala elíptica
rdfs:comment
Un ala elíptica es un ala con una planta elíptica, forma que permite minimizar el .​ La forma elíptica, con una curvatura menor en los extremos, determina un flujo de aire homogéneo a lo largo del ala y una sustentación prácticamente nula en los extremos, con el resultado de un mejor rendimiento aerodinámico. Un'ala ellittica è una configurazione alare apparsa negli anni 30 del XX secolo per diminuire la resistenza aerodinamica degli aeromobili. La forma ellittica riduce la curvatura delle ali fino alla punta causando un flusso d'aria in modo uniforme su tutta la lunghezza e una forza di spinta vicina allo zero alla sua estremità. Tutto ciò permette di migliorare l'efficienza aerodinamica. Il suo impiego, tuttavia, è rimasto limitato per diversi motivi: An elliptical wing is a wing planform whose leading and trailing edges each approximate two segments of an ellipse. It is not to be confused with annular wings, which may be elliptically shaped. Relatively few aircraft have adopted the elliptical wing, an even-smaller number of which attained mass production; the majority of aircraft that did use this feature were introduced during the 1930s and 1940s. Perhaps the most famous aircraft to feature an elliptical wing is the Supermarine Spitfire, a Second World War-era British fighter aircraft. Another major application was the Heinkel He 70 "Blitz", a German fast mail plane and reconnaissance bomber; early versions of the He 111 bomber also used such a wing configuration before a simpler design was adopted for economic reasons. Une aile elliptique est une forme d'aile apparue dans les années 1920 pour diminuer la traînée aérodynamique. La forme elliptique diminue la surface de l'aile à son extrémité, entraînant un écoulement de l'air homogène sur toute la longueur et une force de portance proche de zéro à son extrémité, le tout améliorant l'efficacité aérodynamique grâce à la réduction de la traînée induite. Son usage est cependant resté limité pour diverses raisons : 椭圆形机翼（英語：elliptical wing）是指平面形状近似椭圆形的机翼。 当机翼没有扭转和后掠时，椭圆形机翼的升力分布呈椭圆形。根据，椭圆形升力分布具有最小的诱导阻力。然而椭圆形机翼加工困难、造价高昂，加之有其他设计途径可以使机翼获得近似椭圆形的升力分布，椭圆形机翼在实际设计中并不常见，目前已经绝迹。 采用椭圆形机翼的著名飞机包括第二次世界大战中英国的喷火战斗机与美国的P-47雷霆式战斗机。 Una ala el·líptica és una ala amb una forma en planta que permet minimitzar la resistència induïda.L'ala, contràriament al que es creu, no té forma el·líptica, sinó que segueix una distribució de cordes el·líptica que de no estar alineades pel seu centre aerodinàmic sí que dibuixarien una forma en planta el·líptica. La curvatura de l'ala, més petita en els extrems, determina un flux d'aire homogeni al llarg d'aquesta i una sustentació pràcticament nul·la en els extrems, amb el resultat d'un millor rendiment aerodinàmic.
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The elliptical wing was decided upon quite early on. Aerodynamically it was the best for our purpose because the induced drag caused in producing lift, was lowest when this shape was used: the ellipse was ... theoretically a perfection ... To reduce drag we wanted the lowest possible thickness-to-chord, consistent with the necessary strength. But near the root the wing had to be thick enough to accommodate the retracted undercarriages and the guns ... Mitchell was an intensely practical man ... The ellipse was simply the shape that allowed us the thinnest possible wing with room inside to carry the necessary structure and the things we wanted to cram in. And it looked nice.
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椭圆形机翼（英語：elliptical wing）是指平面形状近似椭圆形的机翼。 当机翼没有扭转和后掠时，椭圆形机翼的升力分布呈椭圆形。根据，椭圆形升力分布具有最小的诱导阻力。然而椭圆形机翼加工困难、造价高昂，加之有其他设计途径可以使机翼获得近似椭圆形的升力分布，椭圆形机翼在实际设计中并不常见，目前已经绝迹。 采用椭圆形机翼的著名飞机包括第二次世界大战中英国的喷火战斗机与美国的P-47雷霆式战斗机。 Un ala elíptica es un ala con una planta elíptica, forma que permite minimizar el .​ La forma elíptica, con una curvatura menor en los extremos, determina un flujo de aire homogéneo a lo largo del ala y una sustentación prácticamente nula en los extremos, con el resultado de un mejor rendimiento aerodinámico. Es difícil de fabricar. La forma tridimensional de los componentes es compleja y cara. La forma elíptica pura no es, necesariamente, la mejor opción. Una forma de elipse truncada puede tener el mismo rendimiento. Un ala trapezoidal, mucho más fácil de fabricar, alcanza casi una efectividad similar. La fuerza de sustentación uniforme aumenta los riesgos de entrada en pérdida de sustentación a baja velocidad.​ Un'ala ellittica è una configurazione alare apparsa negli anni 30 del XX secolo per diminuire la resistenza aerodinamica degli aeromobili. La forma ellittica riduce la curvatura delle ali fino alla punta causando un flusso d'aria in modo uniforme su tutta la lunghezza e una forza di spinta vicina allo zero alla sua estremità. Tutto ciò permette di migliorare l'efficienza aerodinamica. Il suo impiego, tuttavia, è rimasto limitato per diversi motivi: * la fabbricazione di componenti per l'ala ellittica è difficile e costoso; * la forma ellittica pura è difficilmente realizzabile. Un'ellisse troncata può avere la stessa efficacia. E un'ala trapezoidale, più facile da produrre, ha un'efficacia molto prossima a questa. * La spinta uniforme su tutta l'ala aumenta il rischio di stallo a bassa velocità. Una ala el·líptica és una ala amb una forma en planta que permet minimitzar la resistència induïda.L'ala, contràriament al que es creu, no té forma el·líptica, sinó que segueix una distribució de cordes el·líptica que de no estar alineades pel seu centre aerodinàmic sí que dibuixarien una forma en planta el·líptica. La curvatura de l'ala, més petita en els extrems, determina un flux d'aire homogeni al llarg d'aquesta i una sustentació pràcticament nul·la en els extrems, amb el resultat d'un millor rendiment aerodinàmic. És difícil de fabricar. La forma tridimensional dels components és complexa i cara. La forma el·líptica pura no és, necessàriament, la millor opció. Una forma d'el·lipse truncada pot tenir el mateix rendiment. Una ala trapezoïdal, molt més fàcil de fabricar, aconsegueix gairebé una efectivitat semblant. La força de sustentació uniforme augmenta els riscs d'entrada en pèrdua de sustentació a baixa velocitat. An elliptical wing is a wing planform whose leading and trailing edges each approximate two segments of an ellipse. It is not to be confused with annular wings, which may be elliptically shaped. Relatively few aircraft have adopted the elliptical wing, an even-smaller number of which attained mass production; the majority of aircraft that did use this feature were introduced during the 1930s and 1940s. Perhaps the most famous aircraft to feature an elliptical wing is the Supermarine Spitfire, a Second World War-era British fighter aircraft. Another major application was the Heinkel He 70 "Blitz", a German fast mail plane and reconnaissance bomber; early versions of the He 111 bomber also used such a wing configuration before a simpler design was adopted for economic reasons. Une aile elliptique est une forme d'aile apparue dans les années 1920 pour diminuer la traînée aérodynamique. La forme elliptique diminue la surface de l'aile à son extrémité, entraînant un écoulement de l'air homogène sur toute la longueur et une force de portance proche de zéro à son extrémité, le tout améliorant l'efficacité aérodynamique grâce à la réduction de la traînée induite. Son usage est cependant resté limité pour diverses raisons : * la fabrication de composants elliptiques est difficile et coûteuse ; * Une ellipse tronquée peut avoir la même efficacité; * Une aile trapézoïdale, moins complexe à fabriquer, est d'une efficacité proche, ou même supérieure si elle a un meilleur profil (ex.: le P-51 "Mustang") ; * la force de portance uniforme sur toute l'aile augmente les risques de décrochage à basse vitesse.
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