In this study, the main focus is to study the thrust generation of various propeller blade width-spans with the mouth-ring application. By using the parameter, the thrust were calculated based on the value of velocity, voltage and RPM. The testing was performing in three different width-span that are; 10mm, 8mm and 5mm. There are also variable that be tested that cover the reducing the diameter of mouth-ring from 36 mm to 32mm. In addition, if compared the gaps and different position proved that centre position gives better thrust. Furthermore, the application of mouth-ring is evaluated to be good base on this study
