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Natural Frequencies (Hz) as a Function of Rotor Speed
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Rotor Speed (rpm)02468101214
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1st Tower FA0.317490.317490.317490.317490.317490.317490.317490.31749
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1st Tower SS0.323580.323580.323580.323580.323580.323580.323580.32358
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1st Blade Flap (collective)0.690970.690970.690970.690970.690970.690970.690970.69097
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1st Blade Edge (collective)1.703401.703401.703401.703401.703401.703401.703401.70340
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1st Drivetrain3.901503.901503.901503.901503.901503.901503.901503.90150
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2nd Tower FA2.796602.796602.796602.796602.796602.796602.796602.79660
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2nd Tower SS2.933002.933002.933002.933002.933002.933002.933002.93300
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2nd Blade Flap (collective)2.019902.019902.019902.019902.019902.019902.019902.01990
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1P0.000000.033330.066670.100000.133330.166670.200000.23333
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3P0.000000.100000.200000.300000.400000.500000.600000.70000
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6P0.000000.200000.400000.600000.800001.000001.200001.40000
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9P0.000000.300000.600000.900001.200001.500001.800002.10000
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12P0.000000.400000.800001.200001.600002.000002.400002.80000
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