Unification of epitrochoid origin profile design approaches for external lobed star member used in hydrostatic and gear units - Abhijit Nag, Rathindranath Maiti, 2013
Solved The combustion chamber in a Wankel engine has the | Chegg.com
Epitrochoid -- from Wolfram MathWorld
Roulette Circle Spirograph Epitrochoid Point, circle, angle, monochrome, symmetry png | PNGWing