using aeronautical principles
Igor Sikorski built the first practical helicopter
Although the Apache helicopter was invented by McDonnell Douglas, it was built by boeing.
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In 1901 at the age of 16, he built a working model of a helicopter.
Germany
Nobody, they built it
Mad skillz
Helicopters are built, not spawned.
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.
An "as-built" drawing (or set of drawings) are prepared at the end of a construction or engineering project to show the actual configuration of the final system as it was actually built or installed. It may differ significantly from the original plans or subsequent revisions, because it contains the actual state of the project when it is completed and commissioned. Modifications may be noted on the as-builts.
the first plane was built in 1903 the first helicopter was built in 1909