what determines an aircrafts operating cieling,,,?

Question

say they build a 777 and before the bird goes up they already know its cieling how do they come up with that figure

Answer 1

All commercial jets are pressurized for the comfort of the traveler, the manufacturer makes sure they design a safe plane by crunching numbers and mock ups of their planes on computers to ascertain their operating ceiling. This way they save themselves the trouble of crashing airplanes for their tests and it improves their efficiency in making them safe. The use of technology has aided plane manufacturers in this and many other respects for designing safer better more economical airplanes.

Answer 2

The operating ceiling of an aircraft is determined by the pressurization system. At a certain altitude, the pressurization system will no longer be able to maintain the correct pressure altitude inside the cabin. Aircraft are typically pressurized to the equivalent of about 8,000 feet. Above the operating ceiling the pressurization system can no longer maintain this altitude for any number of reasons. Some of those reasons may be that the system is simply not strong enough to pump any more air into the cabin or that if it did the maximum pressure differential between the inside and outside of the aircraft would be exceeded.

The maximum altitude an aircraft can obtain as a funstion of aerodynamics (as was answered by a previous person) is called the absolute altitude of the airplane. That happens when the airplane can only operate at one speed and any power change or pitch change will result in a loss of altitude. You may also see the term "Service ceiling" which is the highest altitude the airplane can attain while maintaining a 100 foot per minute climb rate (50 fpm with one engine inoperative).

Answer 3

The operating ceiling in any aircraft is the point at which the aircrafts air frame, wings and engines operate at their maximums and can no longer produce increased thrust or lift to gain more height. In fact it is known that Pilots whom have attempted to operate at or beyond the "ceiling" of an aircaft in fact see the reverse happen, when they pull on the "stick" or Yoke of an areoplane. Example the Pilot trys to go up to increase altitude by pulling the stick backwards, at the ceiling the aircraft will in fact go down and lose altitude, as the controls are reversed. In Jets the pressurization maximums of the cabin space also determins the ceiling of the aircraft.

Answer 4

The operational requirements of the aircraft are decided long before anyone makes the first drawing, much less when the thing gets built. The engineers determine the structural strength required to meet the service ceiling based on the deceided upon requirements.

Answer 5

SERVICE CEILING The altitude above sea level beyond which an airplane can no longer climb more than 30 m(100 ft) per minute.

Answer 6

They calculate strees values and breaking points on the aircraft. The engines are also run at altidudes to find their max effieciency

Answer 7

They know how much pressure the body can take and how well the engine design will work with various air mixtures at different altitudes.

Answer 8

Lift, Thrust, Drag, ( not like a drag from your blunt ) Wing Shape
and wing angle, Weight, etc.

Answer 9

Simulation software can give the figure.

Answer 10

fuel, type of engines, weight, presence of cabin pressurization and oxygen equipment