As an expert builder using the grace that God gave me, I laid the foundation, and someone else is building on it. But each person must be careful how he builds on it. According to the grace of God given to me, like a skilled master-builder I laid a foundation, but someone else builds on it.
The most-advanced helicopters can fly up to 300 miles before having to refuel. How long any particular helicopter can fly without refueling depends on the size, weight and age of the helicopter.
Retarding blades do not suffer this problem as the airspeed at the tips is reduced, by virtue of the fact that the blades are travelling in the same direction as the airflow caused by flight. <br /> For example: Suppose the speed of Rotor Blade tip (helo in a hover) = 350mph. Speed of the Helicopter in flight = 150mph. Speed of Advancing Blade (in flight) = 350 + 150 = 500mph This simple calculation will determine the maximum speed of the helicopter. Most typical helicopters can only go about 150mph or maybe a little faster. Compound helicopters or the V-22 Tilt-Rotor can fly at over 200mph or even 300mph. The maximum airspeed of a helicopter is limited by the speed of the rotor blade.