using aeronautical principles
Although the Apache helicopter was invented by McDonnell Douglas, it was built by boeing.
Igor Sikorski built the first practical helicopter
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In 1901 at the age of 16, he built a working model of a helicopter.
Germany
Helicopters are built, not spawned.
Mad skillz
Nobody, they built it
The first operational helicopter was built in 1936, the Focke-Wulf Fw 61.
The RAH-66 Comanche helicopter was designed and built by Boeing-Sikorsky.
the first plane was built in 1903 the first helicopter was built in 1909
The first practical helicopter built was the Sikorsky VS300, as in pic.