![]() As we introduce more assumptions into the model, we generally say that the model fidelity decreases. These deviations are called uncertainty in the design community. Each of these assumptions introduces some new deviation between the true flight performance and the performance predicted by the model. ![]() For example, the most significant assumption for a wind tunnel test is that the non-dimensional scaling relationships hold between the wind tunnel and the free flight of the production aircraft, while aerodynamic methods such as panel methods make dozens of high impact assumptions, such as incompressible and inviscid flow. ![]() We must therefore introduce analysis models that provide an approximation of the true aircraft performance.Īnalysis models differ from true performance numbers due to the series of simplifying assumptions that decrease the cost or time to obtain a result. While in certain cases (generally involving cutting edge innovation) this is the only available approach, the cost of building and testing every design is prohibitive. The logical conclusion to draw from this definition leads us to a simple idea: build the design and test its performance. What Role Does Analysis Play in Aircraft Design?Īnalysis can be loosely defied as the steps required to measure the performance of an individual design. ![]()
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