Firstly, I would like to apologize as my english will probably not be perfect.
I am an European engineer, working for a private company that manufactures rocket engine for Ariane 5 launcher. Every day, I wake up and go to work to help manufacturing, testing and developing rocket engines, as thousands of my coworkers. We do not only manufacture rocket engine, but we also adjust each one to be compliant with the technical specification for each mission (mainly commercial mission), based on calculation of the payload, final orbit...) to assure that the trajectory will be compliant with the requirements.
Ariane 5 launchers put into orbit many telecommunication satellites that any of you use every day when using television, GPS (or soon European Galileo), phone, weather forecast and so on... Even if this is just words written on the Internet, I can assure you that rocket engine and rocket as well as satellites are real. I see them almost everyday.
If the Earth was flat as you think, all this work, as well as all the money spent to engage so many people into this lie, would be a pure loss.
So my question is why on (round) earth would so many private companies (Engine/rocket/satellite... manufacturers) be wasting so much money (and we are talking of tens of billions of euro/dollars per year) for something that is not working?
Furthermore, I would like to react to some assessments I read about the fact that rocket technologies are secret and controlled. Do you know that NASA went public about all the researched made during the 60's and 70's? I invit you to search for "NASA SP" + "whatever rocket part you like" (for example :
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19710025474.pdf?bcsi_scan_3885ef0befb2eb28=1&bcsi_scan_cb895f69027bc0de=1&bcsi_scan_023d54aa8e2e45f6=0&bcsi_scan_filename=19710025474.pdf). With all this information, you will have all the necessary information to build a rocket if you would like to (and have enough money for it). Well, OK, not maybe the last and most efficient one, but at least something comparable to the one from the 60's...