Former aerospace engineer, now aerospace historian.
I am posting each of the many, many diagrams I have created over the years. The vast majority of these are diagrams of aircraft and spacecraft designed by actual aerospace design bureaus and companies... they are not fictional. Every effort was made to make sure that the diagrams were as accurate as possible. These were created for publications such as "Aerospace Projects Review," a journal covering unbuilt aircraft and spacecraft projects.
See:
aerospaceprojectsreview.com