Fixed Wings?

[zcase]

@JacopoPan with this repo needing urdf files do you think one could create one for a fixed wing and then provide their own dynamics function to get it working or do you have a different thought?

[JacopoPan]

To be completely honest, given the whole different set of challenges in approximating fixed-wing dynamics (for which PyBullet is probably inappropriate) and the limited use of simulating the interaction between multicopters and fixed-wing vehicle, I think it would make more sense to do that as a completely separate project.