Which outcome occurs when soaring bird surface contour feathers become contaminated with oil?

💡 Explanation

When contour feathers are oiled, reduced drag effectiveness occurs because cohesive forces distort barb alignment increasing turbulence in the smooth airflow boundary layer that normally covers the feather surface crucial for aerodynamic lift while soaring. Therefore reduced flight surface boundary airflow is the consequence, rather than load, absorption or thermal benefits, all require alternative distinct mechanisms.

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