Helicopters

Some experimental helicopters can fly as fast as 300 mph. However most helicopters in service fly less than 200 mph.

Rotors are never enclosed. The control propellor is sometimes enclosed because the designer feels it is safer and more aerodynamic.

Even a cheap civilian helicopter is well over 3 million dollars

The Bell 212 has 2 PT-6 turbine engines. This was basically the ultimate Huey, designed for the Canadian Forces in the late 1960's.

there are a few twin rotor helicopters. The Chinook is possibly most famous.

the pilot guides an aircraft of any kind.

Because they can land in small spaces and hover in flight

That is 'Marine One'

there were no forerunners

Helicopters were an important military invention because they enabled direct air transport without needing a runway. They were thus able to act as transports for the wounded in the Korean war and later in Vietnam from the front line directly to military emergency hospitals. This undoubtedly saved the lives of thousands of injured soldiers. ( The TV series 'MASH' is a great depiction of this ) .

In Vietnam helicopters were more advanced and by then used to land troops in front line locations and in jungle and hilly areas where fixed wing aircraft could not operate. By the end of Vietnam helicopters were also acting in an assault role, able to operate in areas where jet fighters were relatively useless.

In civilian use helicopters became rescue machines for shipping and very useful in many aspects of construction such as helping with erecting power pylons, logging and fire-fighting.

They are never parked on the runway . They park on taxiways designated for parking.

Helicopters propellers are not 'sharp' . They are aero-dynamically shaped.

The full name is Boeing AH-64 Apache.

It is called a rotor, and it more closely resembles a wing than a propeller blade

How are they not environmentally friendly

How are they not.

There are far too many parts to list here, but the unoque ones are the transmission, the rotor hub, the vibration dampers and the tail propellor

helilift

very much like any aircraft.

It depends on the exact specifications, but $5-10 million each is the right ballpark.

1998

Budgie the Little Helicopter was created on 1994-01-04.

Helicopters are made mostly of aluminium because it is strong, light and versatile

In my area they often use them to repair power wires

you have tinnitus