According to the University of California's Citrus Production Manual, for outdoor in ground trees on Flying Dragon root stock it states...."On Flying Dragon, a strongly dwarfed root stock, orange trees not reaching more than about 7 feet tall after 20 years."
I have a Cara Cara in ground tree on Flying Dragon, and it is 11-ft tall and 11 feet wide. However, the tree is growing inside a large greenhouse, and is never subject to wind, and other restricting elements, nor uneven temperatures during the winter months.