Stealth UAV through Coandă Effect

This paper uses CoandăEffect to reduce motors, the source of noise, and finds low noise materials with sufficient lift force so that it can achieve acoustical stealth UAVs.According to NASA research [1], the noise of UAVs is better heard to people. But there must be some moments when we need to operate the drones quietly, so how can we reduce the noise? In previous research, there have also been steady attempts to produce UAVs using CoandăEffect, but have never tried to achieve Acoustic Stealth through Coanda UAVs. But Coanda Effect uses only one motor and is structurally quiet. So we tried to find quiet methods (materials, structures) while at the same time having sufficient stimulus through the CoandăEffect. Verification went through experiments. The control group used the most common type of Quadrone, and determine if the hypothesis is correct by testing various structures and materials under the same conditions, and measuring noise. UAVs using CoandăEffect are not of any shape or structure that is not changeable, and internal space is also empty. That's why the CoandăEffect UAV we present can be improved through follow-up research. That's why the CoandăEffect UAV could open up a new frontier for the Stealth UAVs.