This note explains why casting a loop with a positive angle of attack is advantageous in distance fly casting. Several loop shapes, one with a positive angle of attack, one with a negative angle of attack, and two symmetrical loops with zero angle of attack are studied. For each loop, we compute the vertical drag component, i.e., the “lift.” It is found that a loop with a positive angle of attack generates lift about four times larger than a symmetrical loop. Thus, loops with positive angles of attack stay “aerialized longer” which is consistent with observations made by (competition) distance fly casters.
Effect of Loop Shape on the Drag-Induced Lift of Fly Line
Contributed by the Applied Mechanics Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF APPLIED MECHANICS. Manuscript received by the ASME Applied Mechanics Division, August 28, 2003; final revision, December 16, 2003. Associate Editor: O. M. O’Reilly.
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Gatti-Bono , C., and Perkins , N. C. (November 9, 2004). "Effect of Loop Shape on the Drag-Induced Lift of Fly Line ." ASME. J. Appl. Mech. September 2004; 71(5): 745–747. https://doi.org/10.1115/1.1778414
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