hv15

This is essentially what I was trying to do but the sim runs for a second and then starts producing NaN. I have a feeling that the stability derivatives I was using were for a spin test :doh: I may have to stick with older aircraft instead. Is anyone aware of any newish aircraft with available information on stability derivatives?

Thanks for the reply gyrovague but unfortunately I have seen it :( I have been stuck on this for weeks now. I have been working from the NASA HAARV (Modified F18 ) research papers https://www.nasa.gov/centers/dryden/pdf/88698main_H-2424.pdf which are very interesting if you like that sort of thing. If you look at pg 14 (22/143) the equations of motion are stated. However, it never shows how to solve them. I would be very grateful if someone is able help me with this. After weeks of streaming through research papers, I am ready to tear my hair out!

Hi all, Not sure if this is the right section to post such a question but this is where the brains of the community seem to dwell. As I understand it, flight sims that use look up tables use aerodynamic and control stability derivatives to calculate the forces and moments on an aircraft and then these forces and moments are put into the 6DOF equations of motion to get everything else. The forces depend on angle of attack, sideslip, velocity etc. My question is about how the equations of motion can be solved in a manner that provides the new velocities/ angular rates etc. My studies in Aerospace engineering unfortunately only show how to do this with laplace transforms. Ideally, I want to develop my own flight sim in c++ (rudimentary graphics) for academic purposes. Is anyone able to shed some light on this? (Preferably with the help of equations) :helpsmilie: