A helicopter moves forwards by the rotors spinning, and being slightly tilted. So if the rotors are flat, it will hover. This is because the air being pushed by the rotors is going straight down, not onto another surface, thereby making it go forwards.
many operations involve hovering while cargo is hooked onto a cable or released.
They stabilse the main rotor to keep in one place
A hover craft works by vibration. The bottom of the hover craft vibrates to make it move along the ground. Some hover crafts even have a bottom that spins.
I've never heard that. However, helicopters are limited to the altitude that they can hover, which would limit a Rescue helicopter from picking up a stranded mountain climber. In the high altitude, the air is "thinner" which means the air pressure is less. This limits the effiency of the rotor blades. However, usually the first indication of a problem is when a helicopter tries to hover at high altitude and the tail rotor looses it thurst and the helicopter goes into an uncontrolled spin. This was common with the Bell Model 206B. Even though a helicopter may be limited to the altitude at which it can hover, that does not mean it can't fly at that altitude. If a helicopter maintains a high forward air speed, it can still fly over mountains; its only when it stops and hovers that it may have problems.
they hover
Helicopters are notorious for showing downward thrust, prior to lifting off the ground, in a cloud of dust, flattened grass, or in people clutching their hats as they go to or from the helicopter.
The collective noun 'hover' is used for a hover of trout, a hover of crows, a hover of hummingbirds, and a hover of helicopters.
hover
Vertical take off and set down for one Helicopters can hover.
Hover VTOL (Vertical Take Off and Landing) aircraft can hover as well as helicopters, but helicopters can do it more efficiently and, therefore, can do it for longer periods.
They can land in small spaces and hover in flight
They can land in small spaces and hover in flight
Because they can hover.
helicopters.
Air platforms. Ability to hover. Think about it.
Helicopters can land and takeoff vertically and also hover in flight. Winged aircraft can not do these things.
They can land in small spaces and hover in flight
They stabilse the main rotor to keep in one place