During rotation and airspeed, what direction is the arrow facing?

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Prepare for the Theory of Rotary Wing Flight Test. Sharpen your skills with flashcards and multiple choice questions, with hints and explanations for each. Ace your exam with confidence!

Multiple Choice

During rotation and airspeed, what direction is the arrow facing?

Explanation:
When the rotor is spinning and the helicopter is moving forward, the blade experiences two velocity components: the tangential velocity from rotation and the forward airspeed. The direction of the blade’s relative wind is the vector sum of these components. In the diagram for rotation and airspeed, these two velocity vectors are drawn pointing in the same direction, so their resultant relative wind is along that same line. That’s why the arrow is facing the same way for both components. This alignment alters the local angle of attack across the rotor disk and is a common situation in forward flight.

When the rotor is spinning and the helicopter is moving forward, the blade experiences two velocity components: the tangential velocity from rotation and the forward airspeed. The direction of the blade’s relative wind is the vector sum of these components. In the diagram for rotation and airspeed, these two velocity vectors are drawn pointing in the same direction, so their resultant relative wind is along that same line. That’s why the arrow is facing the same way for both components. This alignment alters the local angle of attack across the rotor disk and is a common situation in forward flight.

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