you tell me cause i dont know!!
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Heinkel made the first for Nazi Germany, but now Boeing and Sikorsky are well-known companies for building helicopters
nobody knows
dura alminium
By chicken wings
Made in America - 2003 Sikorsky Helicopters - 1.10 was released on: USA: 2004
Helicopters can be equipped with either reciprocating (piston) engines or turbine (jet) engines. There is no reason to suspect that advances in electric batteries or hybrid engines will not permit electic motors from powering helicopters in the future as is already done with some small (model) helicopters now.
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 they can do many things that winged aircraft can not do