| 21. | It features a four-blade main rotor and two-blade tail rotor.
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| 22. | The main rotor blades were changed to a titanium-fiberglass composite.
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| 23. | The H160 is the first rotorcraft to feature the Blue Edge five-bladed main rotor.
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| 24. | A main rotor blade separated from the head in flight.
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| 25. | It appears to be less vulnerable because it lacks a rather vulnerable main rotor.
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| 26. | The main rotor is also equipped with two coning hinges.
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| 27. | Thus, the XH-17 had a very small tail rotor compared to its main rotor.
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| 28. | The S-67 featured a five-bladed main rotor and tail rotor.
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| 29. | Its diameter two-bladed rotor has a chord of and employs composite main rotor blades.
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| 30. | The main rotor may be driven by tip jets.
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