Comment Check Out The Orbiter Forums. (Score 5, Informative) 203
If you're looking for technical advice on space flight I would recommend you check out the Orbiter forums. They are the boards for the Orbiter Space Flight simulator. It may be a simulator, but is built to be extremely realistic. You can find a lot of very knowledgeable people on the boards that would probably tell you exactly what you wanted to know. http://orbiter-forum.com/