I don't understand the reasoning for these of your edits to the Piston Motion article:
16:18, 15 November 2013‎ Skarmenadius (8,104 bytes) (-281)‎ (→‎Crank-Rod angle not right angled: Supefluous)
16:16, 15 November 2013‎ Skarmenadius (8,385 bytes) (-102)‎ (→‎Acceleration zero crossings: This way the article stops contradicting itself.)
Ups my bad. I got confused, and thought the horizontal axis that "Acceleration zero crossings" refered to meant angles of 90 degrees. Undid the edits. Skarmenadius ( talk) 11:50, 23 November 2013 (UTC) reply