During rotation and flapping down, what direction is the arrow facing?

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Multiple Choice

During rotation and flapping down, what direction is the arrow facing?

Explanation:
The arrow points slightly up because the blade’s motion through the air is a combination of its horizontal, tangential velocity from rotation and a downward velocity from flapping down. The blade’s velocity is mostly backward (tangent) with a downward component, so the resultant velocity through the air is directed backward and a bit downward. The air flows opposite to that velocity, so the apparent wind (the direction the arrow would show) is opposite to the blade’s motion—in this case, slightly upward.

The arrow points slightly up because the blade’s motion through the air is a combination of its horizontal, tangential velocity from rotation and a downward velocity from flapping down. The blade’s velocity is mostly backward (tangent) with a downward component, so the resultant velocity through the air is directed backward and a bit downward. The air flows opposite to that velocity, so the apparent wind (the direction the arrow would show) is opposite to the blade’s motion—in this case, slightly upward.

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