Because they can do many things that winged aircraft can not do
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According to NASA, future helicopters may be probably made of shape-changing materials.
Heinkel made the first for Nazi Germany, but now Boeing and Sikorsky are well-known companies for building helicopters
By chicken wings
nobody knows
dura alminium
Made in America - 2003 Sikorsky Helicopters - 1.10 was released on: USA: 2004
Made in America - 2003 Sikorsky Helicopters 1-10 was released on: USA: 2004
Helicopters are made with sophisticated specialized engines and heavy materials which is fueled with special gas. They are also made of steel which makes it really heay.
There have been hundreds of helicopters made in the US
Because it made transport easier.
Helicopters have improved and changed since they were first made. Many people and companies still work daily on improvements.