Re: [Flightgear-devel] External FDM to protect propriety data in a GPL eviirenment

[Curtis O. <cur...@fl...>]

Hi Alan,

For one of my past projects I had to deal with a proprietary flight
dynamics model.  I initially used the ethernet interface so it could run as
an external stand alone application.  Then later I switched to a unix
two-way pipe arrangement so I could have tighter synchronization with the
execution order, but still the external program was completely independent
and stand alone.

I'd love to make everything free and open-source, but this was a case where
I didn't have a choice and it was something purchased from a 3rd party
company with strict terms.  I felt that two independent self sufficient
programs (that could talk to each other and exchange information) created
sufficient license separation to honor FlightGear's gpl license terms.

Regards,

Curt.

On Wed, Oct 21, 2015 at 4:35 PM Alan Teeder <ajt...@v-...> wrote:

> I have been working, for several years now, on an accurate TSR2 simulation.
>
> I have access to original and very detailed aerodynamic data, and the
> resulting JSBSIm  FDM closely matches the limited flight test data that I
> also have. To give you an idea of the complexity, my JSBsim aero file is
> 139k, and includes engine effects on flap blowing , inertia and weight
> changes with load/fuel, and covers the full flight envelope. On approach
> and landing It is still not an easy aircraft to fly, but is otherwise OK.
> Terrain following, toss bombing and most systems work as per the original
> specification and crew notes.
>
> However there are problems with releasing the aero data.. The owners of
> the data are happy if I simplify the data, but not if I publish it all as
> is. My projected solution is to make an external FDM using a cross-platform
> compiled language such as java and use this.
>
> What views do the project leaders have regarding this idea?
>
> Alan
>
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