It varies with the type and design.
The answer is complicated because of the large variety of helicopters in the world.
The BELL 206 light helicopter was limited in a hover to around 8000 ft. If it tried to hover above this altitude, the tail rotor would basically stall out.
Also, a helicopter (and an airplane) flies more efficiently close to the ground, which is referred to as "ground effect". For an airplane, the height above the ground is about 1/2 the wing span for it to receive additional lift effect due to in ground effect. A helicopter would be about the same: 1/2 the rotor diameter. So, a helicopter might be able to hover 10 feet above the surface of an 8000 ft mountain.
A baseball, cannonball, or other projectile launched at a 45° angle above the horizon will achieve maximum horizontal range. A projectile launched straight up will achieve maximum altitude, but you kind of have to watch it and be careful when it returns.
A helicopter cannot reach a plane's altitude because it does not have much lift. No, the air is to thin high up for a helicopter to sustain flight.
After the maximum altitude is reached the preesure is so much that the pilot cant go farther. If he goes more than the maximum altitude he will lose consiousness.
That depends on type of helicopter
Because as you increase altitude, the density of air decreases. To compensate for the decreased air density the rotor blades need a greater angle of attack, pushing the retreating blade closer to stall(reducing the maximum airspeed)
there can be any number of reasons for that.
A helicopter needs a solid surface to fly over.
The helicopter's altitude, distance traveled, speed/rate of travel, etc.
To compensate for the decreased air density the rotor blades need a greater angle of attack, pushing the retreating blade closer to stall(reducing the maximum airspeed)
by tilting the rotor
You will have to be more specific as there are many factors to consider ie:- Type of aircraft Piston engine Piston engine turbo charged Jet engined
She hit an altitude record for an autogiro, a forerunner of a helicopter- at l8,4l5 feet, this was computed from theodolite observations from the ground.