Abstract
In this paper, a physics-based computationally inexpensive model is developed to predict aircraft performance variation due to over-the-wing engine installation effects in terms of lift, drag and structure weight at the conceptual stage of aircraft design. The aerodynamic influence caused by the installation of the engine is calculated at cruise conditions using a vortex lattice method. The structural wing weight is calculated iteratively by means of inner loads considering aerodynamic loads, inertial loads and engine thrust. After a parameter study, formulas which can be used to take into account the position of over-the-wing engines during conceptual aircraft design are developed.
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