How much wind will it need to knock the Eiffel Tower?

Answer:
This is unlikely that any wind can knock the Eiffel tower. The engineer Gustave Eiffel required that the tower could withstand a movement of 70 centimeters of magnitude at its top. That never happened and in the highest winds recorded there (240 kilometers by hour in the Dec 1999 tempest), the amplitude was 13 centimeters only.
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