Answer
To allow the helicopter to fly correctly.
Work Step by Step
If there was only one rotor, the net torque on the helicopter itself would not be 0. This would result in the helicopter spinning instead of flying horizontally.
Essential University Physics: Volume 1 (3rd Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0321993721
ISBN 13:
978-0-32199-372-4
Chapter 11 - For Thought and Discussion - Page 200: 7
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