This paper represents an extension to our experimental work published previously in Karali et al., Karali et al. (2016). This new experimental work is mainly performed to overcome all the technical problems issued by the previous work like; camera and light positions. In order to facilitate image analysis processing in rotary drums studies. The experiments are aimed at determining the optimum loading of a flighted rotary drum (1.0 m diameter and 0.3 m length). Number of flights of 12 and 18, flight tangential/radial length ratios of 0.375, 0.75 and in addition 1.0 (for 12 flights only) and rotational speeds of 1, 3 and 5 rpm were researched. Two materials were examined: quartz sand (0.2 mm) particle diameter and glass beads (0.7 mm). All of the results from previous work Karali et al. (2015,2016) and the present work are gathered in one correlation describing the filling degree of a flighted rotary drum as a function of many operating parameters. (C) 2016 Elsevier B.V. All rights reserved.