I found the flat earth FAQ here and read it. I am not impressed. The part I'm probably most interested in is the motions of the sun and moon. This FAQ doesn't even mention the moon. It does mention the sun, but not in a way that is useful. It simply describes the sun orbiting the North Pole in a variable orbit, shining on the earth like a flashlight. This would seem to allow for day and night, but not in a way that lends itself to any mathematical calculations. So, I guess I would say, I'm not impressed.
The first posting by Jack seems to say that there are many models of flat earths, with much disagreement on the details.
Most of what I read in the FAQ, I have seen before elsewhere. I was hoping for something with a bit more rigor. Something that explains how the sun and moon can orbit above the flat earth without falling to the earth. I've read that some people think there is no gravity, that things just naturally fall, or that the flat earth is being accelerated at the rate which we have measured and explained by gravity of the earth.
I guess I'm a bit frustrated. So much of the flat earth description I've found was from detractors, which I'm not inclined to accept as accurate. But, so far, the only material from flat earthers have been the same.
It appears that the flat earthers have yet to even produce a description of how the flat earth model works, much less prove it.
In particular, various experiments to "prove" the earth is flat, seem to be conducted in ways that will prove what you want it to prove. Even when different parties talk about the results online, it seems to reach an impasse and the conversation ends.
So, maybe I'll end my flat earth efforts and worry with more important things, like verifying the moon landings were real.