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#### Jurgen M

Question is indeed very short and clear, but answer will eliminate many doubts and misleading conclusions.

Theory predict downwash that will cause reduction in airflow angle,this we call effective airflow(airflow with lower angle compare at geometric AoA). Does wing of aircraft during flight really "feels" this effective airflow or this is just mathematical manipulation of reality, the way how fit numbers with experimental results?

I will take example with sailing, vectors sum of true wind and boat speed gives apparent wind. This apparent wind sail really "feels", it is not just theory, indeed windex at the top of mast will allways indicated this apparent wind.

Theory predict downwash that will cause reduction in airflow angle,this we call effective airflow(airflow with lower angle compare at geometric AoA). Does wing of aircraft during flight really "feels" this effective airflow or this is just mathematical manipulation of reality, the way how fit numbers with experimental results?

I will take example with sailing, vectors sum of true wind and boat speed gives apparent wind. This apparent wind sail really "feels", it is not just theory, indeed windex at the top of mast will allways indicated this apparent wind.

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