http://aar400.tc.faa.gov/Programs/Fl.../reqcertop.htm

Ran across this, and a few other pages after a Google but haven't yet
found an answer........

Some of the models planes are larger, faster, and more complex than
some human carrying aircraft. The large scale B-52 with 8 turbines
comes to mind.

Just where is the line drawn - if it is at all - between an FAA
regulated UAV and a model plane? Is it size, speed, weight, use
(commercial/hobby), or autonomy that's the deciding factor?

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Leon McAtee