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- W3048829802 abstract "Abstract In a famous report about the induced drag of multiplanes, L. Prandtl conceived the Best Wing System: the lifting system having the minimum induced drag among all the other ones, for assigned wingspan and lift. The resulting shape was a box-wing, asymptotically equivalent to a multiplane having infinite wings. At the end of the report, he gave the performance of this optimal lifting system (in terms of dimensionless induced drag and vertical gap) through a curve, without presenting the method he used. Nowadays, modern computational aerodynamics show an excellent agreement between the numerical results and Prandtl’s prevision. The first part of the paper aims at clarifying which method Prandtl used for the Best Wing System only. In the second part of the paper, starting from Prandtl’s different approach for the biplane and triplane problem, we propose a simple model for the evaluation of the induced drag of multiplanes, using notions an aerodynamicist of 1920s likely had. We show that the limit multiplane having infinitely many wings, under the ansatz of elliptic lift distribution on the outermost wings and constant lift distribution on the innermost ones, matches the Best Wing System curve. This leads to a simple but interesting interpretation of the actual results." @default.
- W3048829802 created "2020-08-18" @default.
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- W3048829802 date "2020-08-10" @default.
- W3048829802 modified "2023-10-01" @default.
- W3048829802 title "A Simple Model for Minimum Induced Drag of Multiplanes: Could Prandtl Do the Same?" @default.
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- W3048829802 doi "https://doi.org/10.1007/s42496-020-00058-y" @default.
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