This work presents a dimensionless approach for a performance analysis of a general electric multi-rotor aircraft with the aim of optimizing the mass ratio of the structure mass and the battery mass for achieving maximal flight time. A review of established approaches for performance analysis of flight vehicles operated by a rotor reveals, that the drivetrain is mostly disregarded in this kind of analysis. Furthermore, the equations of interest were only examined in their dimensionless form to some extend, in most cases this examination relates to the rotor only. Thus, it is impossible to give a general statement about the flight performance for a rotor driven aircraft. Based on these considerations, a dimensionless representation of the performance equations considering the whole aircraft were derived. Furthermore, an analytic solution for the mass ratio for maximal flight time is derived based on the dimensionless equations. This makes it possible to give a general statement about the design of the energy supply of the drivetrain for all electric rotor driven aircrafts.
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