The two orientations used to study knuckle-ball effects. Also

An experimental study of Wiffle ball aerodynamics

Takeshi ASAI, Prof., Doctor of Engineering, University of Tsukuba, Tsukuba, Faculty of Health and Sport Sciences

PDF) A comparison of Jabulani and Brazuca non-spin aerodynamics

Visualization of air flow around soccer ball using a particle image velocimetry

John GOFF, Professor of Physics, PhD, Physics

John GOFF, Professor of Physics, PhD, Physics

PDF] Aerodynamics of the knuckleball pitch: Experimental measurements on slowly rotating baseballs

Forces on a Baseball, Glenn Research Center

Takeshi ASAI, Prof., Doctor of Engineering, University of Tsukuba, Tsukuba, Faculty of Health and Sport Sciences

PDF) Physics of knuckleballs

PDF] The aerodynamics of the knuckleball pitch: An experimental investigation into the effects that the seam and slow rotation have on a baseball

Sungchan Hong's research works University of Tsukuba, Tsukuba and other places

a) Notations used to describe the deviation of a spinning baseball due

Swing and reverse swing of a cricket ball: laminar separation bubble, secondary vortex and wing-tip-like vortices, Journal of Fluid Mechanics