| 41. | Its two-bladed main rotor has a diameter of.
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| 42. | The main rotor head has elastomeric bearings and the main rotor blades are made from composite materials.
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| 43. | The main rotor head has elastomeric bearings and the main rotor blades are made from composite materials.
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| 44. | For helicopters with a single main rotor, the CG is usually close to the main rotor mast.
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| 45. | Coaxial rotors solve the problem of main rotor torque by turning each set of rotors in opposite directions.
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| 46. | A piece of the main rotor was found about 250 yards ( 227 meters ) from the site.
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| 47. | Failure of a swashplate assembly on the tail rotor or main rotor could cause the Apache to crash.
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| 48. | Its main rotor is in diameter.
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| 49. | Tail rotors are simpler than main rotors since they require only collective changes in pitch to vary thrust.
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| 50. | Collective and cyclic pitch inputs to the main rotor are transmitted through pushrods and a conventional swashplate mechanism.
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