| 11. | On 24 January 2014, the CH-53K GTV ignited its GE38-1B engines and spun the rotor head without rotors attached.
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| 12. | Under heavy enemy fire he was able to take on wounded but his helicopter was hit on the rotor head.
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| 13. | The C . 19 Mk V lacked the small wing and all moving control surfaces, relying instead on a tilting rotor head.
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| 14. | The modified 15-year-old helicopter, with new rotor heads, was the only Lynx on board the Richmond, which is based in Portsmouth, England.
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| 15. | Arthur M . Young, American inventor, started work on model helicopters in 1928 using converted electric hover motors to drive the rotor head.
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| 16. | The Hawk 4 had a steel rotor mast and engine mountings but was mostly aluminium elsewhere, including the rotor, rotor head and propeller.
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| 17. | This modification removed the gyroscopic " Stabilization Bar " on top of the main rotor head, instead relying on the computer system for stability.
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| 18. | The solution was to relocate the gyro from the top of the rotor head to below the transmission with flexible connections to the rotor.
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| 19. | In the P . 74 the two Oryx engines fed their outputs to a common duct that took the thrust to the rotor head.
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| 20. | Its diameter rotor has a chord of and is mounted to a rotor head made from a combination of stainless steel and 7075 T6 aluminium.
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