This report provides an overview of the considerations and decisionsmade during the DSE project from the Faculty of Aerospace Engineering, arriving at the final design of the SolidityONE. The goal was to design a vertical take-off and landing vehicle according to the rules from the 37th annual student design competition by the Vertical Flight Society. This design proves the concept of a rotor with disk solidity equal to or larger than 1.0. Additionally, benefits this design has over existing rotorcraft mean it can be tailored to meet the needs of a specific market...