Well, they don't track a kid's remote controlled toy plane.
Good point Nygdan.
Modern hobby type R/C (Radio Control) aircraft could be easily set up to have a fairly long range capability.
Their balsa wood, plastic and foam construction would have a fairly small radar cross section.
Visual identification could be tough as well considering the small size of these aircraft.
Small being defined as a four to ten foot wingspan aircraft.
Hobbyist R/C pilots don't let their airplanes get too far out due to they will get lost in the background visually speaking.
About a quarter mile is it for the smaller ones and maybe a half mile for the larger ones.
Some of these small aircraft are pretty fast, part due to aircraft design, engine choice and the intended use.
Others are very slow and much like a sailplane (called glider by some) and it doesn't take much horsepower - which equates to fuel savings - to
Model aircraft engines from a few years back were of two-stroke/glow plug ignition design with an alcohol based fuel.
Two-strokes are known for their poor MPG capabilities.
Nowadays there are four stroke engines available and MPG is much improved.
Some of these have spark ignition systems with a standard - albeit small - spark plug and many of them run on gasoline which improves the MPG factor
My guess is, if the Iranian drone actually existed it's not much more than a hobby type R/C plane.
More than likely, it's just feel-good propaganda for the Iranian populace and there's nothing flying over any carrier group other than
(Excess word edited out.)
[edit on 1-6-2006 by Desert Dawg]