Interesting to see this topic pop on WIX! This actually happens to be one of my lines of work, creating warbirds for Microsoft's Flight Simulator X (and prior, FS2004). There is quite a difference between one generation of sim to the next, and FSX at present represents the most modern and complex flying simulator for the home computer, allowing for the highest in fidelity of visuals and flight characteristics. Similar to working in CAD, from blueprints, all of my productions (through
http://www.warbirdsim.com) are made using original engineering drawings or drawings made by me from numerous photos and dimensions from the real thing, plugged into the modeling software and recreated, as well as months and years of research through talking with pilots, maintainers, modelers, researchers, etc., to get everything as it really is, to provide the closest experience to reality as possible, apart from actually being able to fly the real thing. For instance, working on the P-51D, a member of the company worked with Peter Teichman in England to get his take on flying the aircraft, to get sound recordings, and then to actually fly in the aircraft first hand to get the experience to match then in the sim.
Just finished two sets of restored P-51D's for FSX, and I'm currently working on a WWII-period set. In every case, the variants are accurate in subtle details to their specific sub-variants (D-5, 10, 15, 20, 25, 30/NA or NT, etc.).


