Yes, helicopters flew successfully by 1946
The first piloted helicopter was invented by Paul Cornu in 1907 and it was not successful. One of the first successful helicopters was built by Etienne Oehmichen in 1924 and flew for 1 kilometer.
How far can helicopter fly on a one tank of gas
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Depends on the purpose and make of the helicopter.
It depends what you mean by the term 'ultralight' ! If you mean a scale model of a helicopter that you fly by remote control - no. If you mean a full-size helicopter you actually sit in to fly - yes.
The helicopter might not fly because the battery is dead and needs to be charged or because you have the remote and helicopter on different frequencies.
No. A helicopter is not faster than an airplane. A helicopter could fly at about 400-650 kph. But a plane could fly much faster than that.
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