helicopters are not supposed to fly, turn off the engine and you will find out why. ( not in real life)
you can't just let go of the stick and it will go level it will probably nose dive
I have treid a navy copper pilot sim in one of thier recruitment trailers, I managed to get it on the carrier it was a bit of a **** through
Apparently it is actually possible to land a helicopter where the engine has failed, although it's obviously quite difficult.
Also, many modern helicopters have one or even two backup engines.