Flight envelope

[Judedarwinism]

Can i obtain the explicit description of flight envelope of aircraft model in JSBSim?

[seanmcleod]

No, the data in the aircraft model file doesn't include that explicitly.

[bomber64]

When you say flight envelope....

Are you after flying the plane and recording how it performs ?

If so that is possible

Or is it something else you're after ?

[agodemar]

@bomber64 'Flight envelope' is not an ambiguous term.
See here: https://en.wikipedia.org/wiki/Flight_envelope
Probably @Judedarwinism refers to the altitude envelope, or 'H-M diagram'

[Judedarwinism]

Yes, that's what i mean in this picture. Thanks very much. To more precisely speak, i want to know and quantify the boundary conditions of the airplane in JSBSim.

[seanmcleod]

@Judedarwinism were you hoping to open a JSBSim aircraft model file, e.g. https://github.com/JSBSim-Team/jsbsim/blob/master/aircraft/737/737.xml and find these sorts of flight envelopes listed?

Or are you asking whether there is some JSBSim function which you can use to load a particular aircraft model file and then have JSBSim generate these flight envelopes for you?

Neither option, i.e. pre-generated data in the aircraft model file or some JSBSim envelope function are available.

So you'll either need to fly the model as a test pilot to collect the relevant data, or write an auto-pilot to act as a test pilot, or make use of some of the data you find in the aircraft model file and perform your own calculations. For example that's what I do with my EM Diagram generator - https://github.com/seanmcleod/EMDiagrams/blob/master/EMDiagrams.ipynb

You could also make use of say some python scripting with JSBSim to calculate some of the flight envelope boundaries.