, the maximum flight speed of the helicopter will also decrease with the increase of flight altitude, and its surface speed is synchronized with the change of air density and temperature.
So?
The general ceiling of civil helicopters is 2,000-4,000 meters, and some military aircraft can reach more than 6,000 meters, like the maximum ceiling of the Z-9 helicopter of the Chinese Army Aviation Force is 6,000 kilometers.
The Apache helicopter developed by the Hughes Company has a practical ceiling of 6,250 meters.
In addition, the SA-3158 Rheas helicopter from France.
On June 21, 1972, pilot Gene Paulette flew the Rhea to a world record altitude of 12,442 meters.
Royal Nepalese Air Force pilots have set a world record for rescuing climbers in distress at an altitude of 6,500m.
So, in theory, helicopters can fly up Everest, but no practical models can yet.
The maximum flat flight speed is 324 km/h, the cruising speed is 250-260 km/h, the maximum climb rate (sea level) is 4.2 m/s, the practical ceiling is 6000 m, the hovering height is 1950 m with ground effect, the non-ground effect is 1020 m, the maximum range is 1030 km, the maximum endurance time is 5 hours.
