In this study, the main focus is to investigate the thrust generation of various propeller blade width-spans with the relation of mouth-ring application. By using the parameter, the thrust was calculated based on the value of velocity, voltage and rpm. The testing was performed in two condition that is with mouth-ring and without mouth-ring and 2 size of propeller been tested in this experiment. The application of mouth-ring is based on the gap between the wall of mouth-ring and the blade tip. There are 3 size of gap; 10mm, 8mm and 5mm. The result shows that 10mm mouth-ring have better thrust generation other than two gap. In addition, if compare to with and without mouth-ring, the application of mouth-ring also has proved it has a better thrust. Furthermore, the application of mouth-ring is evaluating to be good base on this study.
