This model is intended to be used with the OR17 project that i able to manipulate in real time complex 3D objects with a cinema-like quality.
The full "3D wavefront OBJ reader" project is here:
https://depot.PC SOFT.fr/resource.awp?file_id=281474976710890;3d-wavefront-obj-reader
Once downloaded, put the "Spitfire" folder into the "EXE\3D_models" directory to let it be selected from the combobox after you restart the application.
Don't forget to turn on the sound, and you will hear an authentic Rolls Royce Merlin engine