They don't have to . That is a myth.
Helicopters fly somewhat close to the ground. They fly near the troposphere. They fly at a lower altitude than planes.
They fly helicopters.
Because rotors are noisy and helicopters isually fly close to ground
You can fly helicopters.
They fly in California.
There are many different helicopters. Most small civilian helicopters may fly for about an hour, but large passenger or military helicopters can fly for 6 hours or more.
No
so we can fly
Yes, there are helicopters available.
Helicopters can fly directly up or down.
Some experimental helicopters can fly as fast as 300 mph. However most helicopters in service fly less than 200 mph.
to fly ?