eccles, folks upload technical information all the time in the
Technical - Aircraft of World War II - Warbird Forums section.
You can head over there, and choose the section that would best apply to your PDF, and then upload it to share. If no thread exists with your MiG-9 data, then why not create one
To upload a file, whether it's an image, video or a PDF, simply click the
POST REPLY or
NEW THREAD button. You will see the message area for your text, and directly below that is the
Additional Options area, find and click the
Manage Attachments button and an upload panel will appear.
It's pretty straightforward from there