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The helicopter initial design model was established by using th e latest weight estimation equations based on the Tishchenko's methodology through the stu dy existing initial design tools. The sequential decomposition method is used to reduce an alysis time in the sizing. Empirical parameters of the weight estimation equation were als o extracted from numerical and regression analysis for a helicopter database. Design input and output values were compared with the RISPECT design tool. Finally, comparison of t he re-design resulting for several existing helicopters was presented and showed the good agreement within less than 5% in the weight estimation and main rotor sizing. Establi shed initial design model was proved to be effectively used as initial design tool.            ,            .   Tishchenko      ,          . ,                          .         RISPECT        ,              5%          . Key Words : Rotorcraft(), Helicopter Design( ), Design Parameter( ), Database(), Empirical Parameter(), Trend Curve(), Regression Analysis()

A Study on Establishment of the Helicopter Initial Design Model Using the Modified Weight Estimation Equations