Area Rule Factor

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For nacelle/fuselage or nacelle/wing intersections with no local area ruling:

1.0

For nacelle/fuselage or nacelle/wing intersections with local area ruling:

0.5

For the wing interference this factor is automatically set to 1.0 for M < 0.5 and decreases smoothly to 0.5 at M = 0.6 if area ruling is used