Sorry folks but... using nothing but latex balloons and a cheap camera we (at La Bisbal school in Spanish Catalonia) have managed to photograph the Earth from 20 miles up, clearly showing the Earth's curve. You can find details by searching us and then you can repeat our experiment.
I don't know, perhaps you can turn this website into an information resource about the history of flat Earth ideas. But, when it's as easy to prove as this -a balloon and a $60 camera- it really is over for you.