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efferman: Sikorsky CH-53
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efferman: flat rotorhead
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efferman: ch-53_7_blade
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efferman: 7 blade Rotor
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efferman: Rotor angle
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efferman: ch-53_1
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efferman: ch-53_2
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efferman: ch-53_3
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efferman: ch-53_4
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efferman: 7 blade rotorhead
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efferman: 7 blade rotorhead
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efferman: Tail rotor collective pitch control
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efferman: fat blade
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efferman: ch-53_5