For a fairly new helicopter, around 120 knots.
Around 150 mph, except for fast military helicopters.
About 170 mph.
That is about 160 mph.
80
What would you call "average". I don't see there is an "average" helicopter, all are different.
That cannot be calculated without knowing the average speed over that distance.
The weight of the helicopter affects the terminal speed by influencing the rate at which the helicopter falls. A heavier helicopter will reach a higher terminal velocity compared to a lighter helicopter, as the force of gravity will be greater on the heavier helicopter, causing it to accelerate faster. Additionally, a heavier helicopter may require more lift to counteract its weight, which can also impact its terminal speed.
09527349074537mph
There are many different helicopter engines, most of them now jets
Cruising speed is about 150 mph.
To find the average speed, first calculate the total distance and total time. The total distance is 50 km + 30 km = 80 km. The total time is 20 minutes + 10 minutes = 30 minutes, which is 0.5 hours. The average speed is then total distance divided by total time: 80 km / 0.5 hours = 160 km/h. Thus, the average speed of the helicopter is 160 km/h.
The helicopter begins to fall because gravity is pulling its weight. As the helicopter accelerates, the air passing past the helicopter creates drag, as the helicopter continues to accelerate the drag Increases until the drag becomes equal to the weight, stopping it from accelerating. Even if the helicopter did not auto rotate it would still reach a terminal speed, however the terminal speed for the non auto rotating helicopter would be a lot higher and the helicopter would take longer to reach this speed.
They change the speed and angle of rotor, and speed of tail propeller.