| 31. | The main rotors are both of fixed pitch design, with no articulation in any axis.
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| 32. | Most helicopters have a single main rotor but require a separate rotor to overcome torque.
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| 33. | This also resulted in the main rotor being mounted very close to the cabin roof.
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| 34. | They felt flying debris and later picked up pieces of the tail and main rotor.
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| 35. | This creates a force which cancels out the main rotor torque and provides directional control.
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| 36. | The main rotor had three blades with steel tubing for the centre, covered with wood.
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| 37. | The effect was to swap those letters before and after the main rotor scrambling unit.
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| 38. | The four-bladed main rotor consisted of two pairs of blades mounted one above the other.
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| 39. | Also, the coaxial main rotor configuration does not require tail rotor, which can improve survivability.
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| 40. | The main rotor system is of low-inertia and requires pilot skill to manage energy on landing.
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