Summary
The lifting system with minimum induced drag is a closed wing with a box shaped front view and was named Best Wing System by Prandtl; on the horizontal wings, the circulation results from the superposition of an elliptical and a constant distributions and, on the the side walls, it is butterfly shaped. Very recently, the Prandtl results (obtained by an approximate procedure) were confirmed by a closed form solution, briefly described in the paper. The concept of minimum induced drag can give rise to a family of aircraft, ranging from very small to very large (larger than the A3XX) aircraft and still compatible with the actual airport areas. These aircraft are named as PrandtlPlane, in honor of Prandtl. An example of a 600 seat category aircraft is presented.
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References
L.Prandtl, Induced Drag of Multiplanes, NACA TN 182, (1924).
A. Frediani, G. Montanari, M. Pappalardo, Sul problema di Prandtl della minima resistenza indotta di un sistema portante (in Italian), Proceedings of the XV Congress of AIDAA, Turin 15–19 November, (1999), pp. 267–278.
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© 2001 Springer-Verlag Berlin Heidelberg
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Frediani, A., Chiarelli, M., Longhi, A., Troiani, E. (2001). The Lifting System with Minimum Induced Drag. In: Thiede, P. (eds) Aerodynamic Drag Reduction Technologies. Notes on Numerical Fluid Mechanics (NNFM), vol 76. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-45359-8_33
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DOI: https://doi.org/10.1007/978-3-540-45359-8_33
Publisher Name: Springer, Berlin, Heidelberg
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