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First twin turbine-powered helicopter

First twin turbine-powered helicopter
Who
Kaman HTK-1
What
First
Where
United States
When
March 1954
Following his development of the first turbine powered helicopter, the American aeronautical engineer, Charles Kaman, introduced the world’s first, twin-turbine (jet) powered helicopter in March 1954. The aircraft was a modified Kaman HTK-1, Bureau Number 128657.