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APPROACHES FOR DETERMINATION OF DRAG POLARS FROM FLIGHT DATA
The estimation of drag polars (drag coefficient vs. lift coefficient) is an important activity in any aircraft development/flight-test program. Drag polar data are required to assess the actual performance capability of the aircraft from flight test data. Dynamic flight test maneuvers of various types [25,26] can be performed on an aircraft and the data analyzed using OEM for a stable aircraft and SOEMs for unstable/augmented aircraft. Dynamic maneuvers such as RC, SD, and WUT are most suitable for drag polar determination. Model-based and non-model-based approaches are suitable for determination of drag polars and these are linked in Figure 9.5 [27]. The estimation before the modeling method can be used to
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Flight test data
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determine the structure of the aerodynamic model to be used in the model-based approach.
