Performance and Limitations Flashcards
(13 cards)
What is the atmosphere composed of?
78% Nitrogen, 21% Oxygen, and 1% other gases.
What are two dominant factors that effect the performance of an aircraft?
Pressure and Temperature
At what altitude is most of the oxygen contained below?
35,000 feet
At sea level what is the average pressure that is exerted on any one individual (psi)
14.7 psi
As air becomes less dense, what does it reduce?
Power, because the engine takes in less air.
Thrust, because the propeller is less efficient in thin air.
Lift, because the thin air exerts less force on the airfoils.
What is the standard atmospheric pressure at sea level?
59 degree F (15 degrees C) 29.92 inches of mercury (“hg) or 1013.2 millibars (mb)
What is the standard temp. lapse rate?
2 degrees C per 1,000 feet up to 36,000 ft. After that it is considered constant up to 80,000 ft
What is the standard pressure lapse rate?
1 “Hg per 1000 ft up to 10,000 ft.
What is pressure altitude?
Is the height above the standard datum plane. (29.92)
What is density altitude?
Pressure altitude corrected for nonstandard temperature.
As the density of the air increase, what happens to the performance?
It increases.
High density altitude refers to what?
Thin air
Low density altitude refers to what?
Dense air
