The average cruising speed of a helicopter is 300 km/h; in comparison, the one of an airplane is 850 km/h. This is due to the operating principle of a helicopter and its rotor.
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Yes, an aircraft can stay in the air without going forward if the oncoming wind, called headwinds are equal or greater than th minimum speed of that aircraft. This principle is used in the wind tunnels to experiment the flight characteristics by blowing the wind to the aerofoil and assess the aerodynamic changes.
In general, most helicopters can fly for an extended period of time or a significant distance before needing to stop or refuel. Typically, this equates to 2.5 to 5 hours on one tank of gas, which translates to a range of 320 to 640 km. Of course, not all helicopters are capable of this.
The crash rate for general aircraft is 7.28 crashes per 100,000 hours of flight time. For helicopters, that number is 9.84 per 100,000 hours. That means helicopters have a 35 percent higher risk of crashing compared to airplanes.
Since helicopters typically land and take off far more often than larger aircraft, and since general aviation pilots aren't required to have as much training or experience as commercial pilots, helicopter flights are more prone to accidents, including fatal ones.
AW101 All-Weather capabilities highlighted in 4,800 nm transit across the North Atlantic. The AW101 helicopter successfully completed an epic journey across the North Atlantic to return to the UK across mountains, high seas, storm clouds, ice, and snow.
Techincally, there is only one way for the aircraft to remain hanging motionless in the air: if weight and lift cancel each other out perfectly, and at the same time thrust and drag cancel each other out too. But this is incredibly rare. To stay in the air and sustain its flight, an aircraft needs to be moving forward.
Flight times within the duty periods are restricted to a maximum of 8 hours for flight crews consisting of one pilot and 10 hours for flight crews consisting of two pilots. The 8-hour and 10-hour flight time limitations include any additional commercial flying performed by the flight crew during the period.
Do pilots always walk-around the plane? Before each flight, in addition to the checks the engineers complete, one of the pilots will always conduct an exterior walk-around of the aircraft to ensure that they are happy with its condition.