Hi fellow wiki editors!

To help newly registered users get more familiar with the wiki (and maybe older users too) there is now a {{Welcome to the wiki}} template. Have a look at it and feel free to add it to new users discussion pages (and perhaps your own).

I have tried to keep the template short, but meaningful. /Johan G

Howto:Get the standard atmosphere

From FlightGear wiki
Jump to: navigation, search

Sometimes you want to get the standard atmosphere for example when testing a flight dynamics model (FDM).

Why using the standard atmosphere?

Usually aircraft performance is given for the International Standard Atmosphere This is a link to a Wikipedia article (ISA). Often these numbers or graphs are complemented with additional ones for a colder or warmer atmosphere (for example ISA+20°C).

When comparing performance of FlightGear aircraft against published performance of real world counterparts it is of course helpful to do that against the same conditions (real world performance numbers are reduced, mathematically corrected, to the performance in a standard atmosphere).

How to get it

  1. Start up FlightGear
  2. Open up the property browser (e.g. via --prop:browser=environment)
  3. Set /environment/config/enabled to false
  4. Set /environment/atmosphere/temperature-deg-sea-level to 15
  5. Set /environment/atmosphere/pressure-inhg-sea-level to 29.92126
  6. Set /environment/atmosphere/wind-speed-kt to 0
--prop:/environment/config/enabled=0
--prop:/environment/atmosphere/temperature-deg-sea-level=15
--prop:/environment/atmosphere/pressure-inhg-sea-level=29.92126
--prop:/environment/atmosphere/wind-speed-kt=0

Related content