FYI . . Go to Google earth, Open, then go to "Beale AFB, CA" . .
Pull in the image of the Flight Line Apron. On it you'll see four black Airplanes with long wings . . those are U2's. A U2 is a fair sized aircraft. Note the "Silver aircraft" sitting at the North end of the line of U2's . . That's a "Reaper" drone. Big Mutha, ain't it?
Now to get another idea of scale between the Reaper and the "Predator", look a little further North on the Apron, and you'll see a U2 being tugged out of a hangar. Right beside it is a "Predator" Drone . . . It's "only" about the same size as a U2 . .
To give you a further idea of size and scale, look at the far North on the Apron. There's 4 T-38s (I think that's what they are) and on the Apron, about midway is a Mitsubishi Twin.
Bigassed Model Airplanes, huh?