Abstract
A prototype tail-sitter mini unmanned aircraft (SkyEyeV) was developed and tested in a wind tunnel and semi-automatic flights. A tail-sitter is an aircraft that takes off and lands on its tail section with the fuselage pointing upwards. A key feature of the prototype is the leading edge slats, which are incorporated in its design to avoid stall during flight at high angles of attack. Through wind tunnel testing—aerodynamic force measurements and airflow visualization via tuft method—it was confirmed that the slats increase the stall angle of attack not only in the non-powered condition (without propeller) but also in the powered condition (wing in propeller slipstream). On conducting semi-automatic flight testing, the vehicle's flight characteristics were verified, and several useful insights were obtained requiring further investigation.
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