Division Specific Treatments of Ground-roll Segments, including the start-of-roll directivity function Δ SOR
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In the case of ground roll segments, both for takeoff and landing, specific treatments are applied, which are described below.
Notes on Division 2.7.19
Footnotes
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NPD specifications require that the data be based on measurements of steady straight flight, not necessarily level; to create the necessary flight conditions, the test aircraft flight path can be inclined to the horizontal. However, as will be seen, inclined paths lead to computational difficulties and, when using the data for modelling, it is convenient to visualise the source paths as being both straight and level.