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Rotorcraft theory > Chapter 6 > Flashcards

Chapter 6 Flashcards

1
Q

With forward speed increase, how will the reverse flow area change and how will it
influence the rotor aerodynamics

A

The reverse flow area will increase with forward speed, and it would reduce the rotor thrust
and increase the rotor drag.

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2
Q

Write the comprehensive expression of the blade control angle and indicate which is the
longitudinal and lateral cyclic pitch.

A

πœƒ=πœƒ0 +𝐴1π‘ π‘–π‘›πœ“+𝐡1π‘π‘œπ‘ πœ“+π‘Ÿπœƒpretwist
π‘€β„Žπ‘’π‘Ÿπ‘’ 𝐴1 𝑖𝑠 π‘‘β„Žπ‘’ π‘™π‘œπ‘›π‘”π‘–π‘‘π‘’π‘‘π‘–π‘›π‘Žπ‘™ 𝑐𝑦𝑐𝑙𝑖𝑐 π‘π‘–π‘‘π‘β„Ž,π‘Žπ‘›π‘‘ 𝐡1 𝑖𝑠 π‘‘β„Žπ‘’ π‘™π‘Žπ‘‘π‘’π‘Ÿπ‘Žπ‘™ 𝑐𝑦𝑐𝑙𝑖𝑐 π‘π‘–π‘‘π‘β„Ž

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3
Q

How will the flapping offset provide additional control moments and how will it influence the
pitching and rolling damping?

A

The flapping offset gives a moment to let the rotor thrust contribute to the control moment,
which is called the hub moment. The flapping offset can make the rotor provide additional
pitching and rolling damping.

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Rotorcraft theory (9 decks)

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