Drones have seen enormous applications in the world and continue to progress rapidly. But the main issues faced by drones are low flight time, high noise, and lower thrust-to-weight ratio. It makes the drone vulnerable in the long run, with lesser domains for application. The paper includes a passive method to decrease the noise of the propeller primarily. It is an experimental investigation of the proposed hypothesis. Using a cased diffuser can be helpful to counter the issues faced. It was found that the noise levels had dropped by 5% after using a diffuser casing. Along with that, there were other parameters like thrust and energy consumption, which have also improved by up to 110% and 17% respectively as a result.