14.8: Altitude
With increasing flight altitude the atmospheric pressure decreases. The lift
and also the drag become smaller. In order to achieve the same lift as at
ground level, one must fly faster. That is not a problem, because also the drag
is smaller and thus one can fly faster with the same thrust. One hitch remains,
unfortunately also the performance of the aircraft engine decreases with
increasing flight altitude (it takes the engine's breath away).
The dimensional unit for entered data is 'meter' [m]. You can enter the altitude
manually, or you can use the Up/Down-buttons located near the input field.
The air density in different altitudes is linear computed from the following
table.
0,000m; 1.225kg/m^3
1,000m; 1.112kg/m^3
2,000m; 1.007kg/m^3
3,000m; 0.909kg/m^3
4,000m; 0.819kg/m^3
5,000m; 0.736kg/m^3
6,000m; 0.660kg/m^3
7,000m; 0.590kg/m^3
8,000m; 0.526kg/m^3
9,000m; 0.467kg/m^3
10,000m; 0.414kg/m^3
11,000m; 0.365kg/m^3
12,000m; 0.312kg/m^3
13,000m; 0.267kg/m^3
14,000m; 0.228kg/m^3
15,000m; 0.195kg/m^3
16,000m; 0.166kg/m^3
17,000m; 0.142kg/m^3
18,000m; 0.122kg/m^3
19,000m; 0.104kg/m^3
20,000m; 0.089kg/m^3
21,000m; 0.076kg/m^3
22,000m; 0.065kg/m^3
23,000m; 0.055kg/m^3
24,000m; 0.047kg/m^3
25,000m; 0.040kg/m^3