Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 8 - Think and Explain: 98

Answer

If the small tail rotor failed in flight, the body of the helicopter would begin to rotate in a sense opposite to that of the main rotor. Under normal operation, the small tail rotor provides a counter-torque to prevent the cabin from rotating.
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