| 11. | It has a three-bladed main rotor, and a two-bladed tail rotor.
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| 12. | The main rotor and transmission system of the R-4 were retained.
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| 13. | The D2's main rotor had constant fairing on a cantilever leg.
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| 14. | The Z-18 uses composite materials for the rotor blade and titanium main rotor.
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| 15. | The CH-53E also added a larger main rotor system with a seventh blade.
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| 16. | The main rotor has a teetering hinge and two coning hinges.
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| 17. | Eyewitnesses said it appeared the main rotor of the helicopter was not moving.
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| 18. | Photographs showed that the crash damaged the helicopter's main rotor blades and tail.
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| 19. | Vertical-axis wind turbines ( or VAWTs ) have the main rotor shaft arranged vertically.
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| 20. | The engines power an 18.59 metre diameter five-bladed main rotor.
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