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