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

Knuckleball Physics In Street Language

SPORTS BALL AERODYNAMICS: EFFECTS OF VELOCITY - TMS

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

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

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

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

IIT Kanpur discovers knuckleball 2.0: This one goes zigzag in the air

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

John GOFF, Professor of Physics, PhD, Physics

What are the advantages and disadvantages of using the knuckleball as a primary pitch in baseball? - Quora

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

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

When a baseball pitcher throws a knuckleball, the ball has no rotation and appears to flutter. What makes it flutter? - Quora