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What is the highest theoretical and current flight a helicopter can achieve?

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This (and more) is quite easily answered by Wikipedia

Highest altitude without payload 12,442 m (40,820 ft) Aerospatiale Lama

Highest level flight altitude 11,010 m (36,120 ft) Sikorsky CH-54 Tarhe

Altitude with 40-tonne payload 2,255 m (7,398 ft) Mil V-12

Visit the linked Wikipedia article for more records and sources.

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