Constants
Global atmosphere constants¶
| Constant | Description | Value | Unit / Notes |
|---|---|---|---|
cStandardHumidity |
Relative Humidity in percents | 0.0 | % |
cPressureExponent |
=gM/RL | 5.255876 | - |
cA0 |
Coefficient A0 | 1.24871 | - |
cA1 |
Coefficient A1 | 0.0988438 | - |
cA2 |
Coefficient A2 | 0.00152907 | - |
cA3 |
Coefficient A3 | -3.07031e-06 | - |
cA4 |
Coefficient A4 | 4.21329e-07 | - |
cA5 |
Coefficient A5 | 3.342e-04 | - |
ISA, metric prefer_units¶
| Constant | Description | Value | Unit / Notes |
|---|---|---|---|
cDegreesCtoK |
Celsius to Kelvin conversion | 273.15 | °K = °C + 273.15 |
cStandardTemperatureC |
Standard temperature in Celsius | 15.0 | °C |
cLapseRateMetric |
Metric lapse rate | -6.5e-03 | °C/m |
cStandardPressureMetric |
Standard pressure (metric) | 1013.25 | hPa |
cSpeedOfSoundMetric |
Speed of sound in metric | 331.3 | m/s |
cStandardDensityMetric |
Standard air density (metric) | 1.2250 | kg/m³ |
cDensityImperialToMetric |
Density conversion (imperial to metric) | 16.0185 | lb/ft³ to kg/m³ |
ICAO standard atmosphere¶
| Constant | Description | Value | Unit / Notes |
|---|---|---|---|
cDegreesFtoR |
Fahrenheit to Rankine conversion | 459.67 | °R = °F + 459.67 |
cStandardTemperatureF |
Standard temperature in Fahrenheit | 59.0 | °F |
cLapseRateImperial |
Imperial lapse rate | -3.56616e-03 | °F/ft |
cStandardPressure |
Standard pressure (imperial) | 29.92 | InHg |
cSpeedOfSoundImperial |
Speed of sound (imperial) | 49.0223 | fps |
cStandardDensity |
Standard air density (imperial) | 0.076474 | lb/ft³ |
Runtime limits constants¶
| Constant | Description | Value | Unit / Notes |
|---|---|---|---|
cLowestTempF |
Lowest temperature recorded | -130 | °F |
cMaxWindDistanceFeet |
Maximum wind distance | 1e8 | ft |