Innovative design of coaxial helicopter

ABSTRACT INNOVATIVE DESIGN OF COAXIAL HELICOPTER ŞAVKIN, Burak M.Sc. in Aircraft and Aerospace Engineering Supervisor: Asst. Prof. Dr. Mehmet Hanifi DOĞRU December 2019 57 pages The aim of this study is to design a coaxial helicopter without tail by introducing a new perspective to coaxial helicopter design. The tail rotor system has caused continuous problems in rotary wing aircraft. For this reason, the studies related to the coaxial helicopters in the literature have been examined and the details of these have been presented in the study. In accordance with the objective of the study, flow analyzes were performed to obtain the thrust forces of single propeller and multiple propeller systems. In the analysis, surface parameters which are one of the objective parameters were used to obtain the thrust force. The analyzes were carried out based on the variable number of rotations of the propellers. In this way, it was determined how much thrust the propeller can obtain at the given rpm. In addition, the results of the analyzes were validated by theoretical calculations. When the error rates are examined, it is seen that the results obtained from both theory and analysis are significant. When the results obtained from the coaxial multi-propeller system were examined, it was found that more thrust can be obtained than the single-propeller system. After the analyzes were verified with calculations, tailless coaxial helicopter design was made. With the realized design, a more secure system was designed. Key Words: Coaxial Helicopters, Design, Flow Analysis.