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.
The speed of helicopter rotor blades through the air is limited by  the speed of sound (approx. 760Mph) at which point the pressure  wave disrupts the airflow at the blade t â¦ ip (which is moving through  the air faster than the blade root).