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Umm...
http://www.hobby-lobby.com/rc_video_cameras_363_ctg.htm
People have been doing it for years. I think the first RC airplane I saw with a "movie" camera was in Model Aircraft News around 1975. I was pretty young but if I remember it was a pusher with a twin boom tail with the Horizontal stabilizer carried on the tops of the vertical stabilizers.
With the low cost electric foam aircraft available today along with cheap small digital video cameras it has become very common.
Today you can add a camera to a plane with duct tape if you want.

Well some remote controlled airplanes are actually pretty big. Here is one with a 12' wing span. It could lift say 7 kg with no real problem. http://www.hobby-lobby.com/telemaster12.htm Maybe cut that to 4kg and use electric power and if you covered it in light grey you no one would see it until impact. but 4 or 7 kg would kill anyone outside near the impact point. You would aim it at an entrance time the impact for say 5:50 pm in the winter so that it is dark, Sure it wouldn't blow up the entire building but it would still suck to die or have your arm or leg blown off.

Well some remote controlled airplanes are actually pretty big. Here is one with a 12' wing span. It could lift say 7 kg with no real problem. http://www.hobby-lobby.com/telemaster12.htm Maybe cut that to 4kg and use electric power and if you covered it in light grey you no one would see it until impact. but 4 or 7 kg would kill anyone outside near the impact point. You would aim it at an entrance time the impact for say 5:50 pm in the winter so that it is dark, Sure it wouldn't blow up the entire building but it would still suck to die or have your arm or leg blown off.

How do you know all that? You must be plotting an attack yourself! You can expect a visit from us the next time we need a headline!
Sincerely,
The FBI

Well some remote controlled airplanes are actually pretty big. Here is one with a 12' wing span. It could lift say 7 kg with no real problem. http://www.hobby-lobby.com/telemaster12.htm Maybe cut that to 4kg and use electric power and if you covered it in light grey you no one would see it until impact. but 4 or 7 kg would kill anyone outside near the impact point. You would aim it at an entrance time the impact for say 5:50 pm in the winter so that it is dark, Sure it wouldn't blow up the entire building but it would still suck to die or have your arm or leg blown off.

The carbon fiber parts where from hobby-lobby. Although we'll be getting them from HobbyKing in the future because it's something like $5/rod.

The only specialty part was the OpenPilot CopterControl module. That was indeed all of $100. Appropriately sized BLDCs can be bought for $7/ea., a radio is $50, the props are $1.50/ea., the battery was $20, the charger was not high output, and there are a few other components that you didn't list which I won't either in the interests of conciseness. Suffice to say that you can build a complete, functioning quadcopter with a CopterControl for all of $250, incl. the transmitter/receiver combo.

Who don't you sue?

And how about building the model airplane? That's pretty safe.

The post made me think of something like this...

Hmm, I guess the kid might glue his mouth shut or huff the glue. Guess we'll have to sue Borden or something.

The U.S. is now officially a culture that slaps "Warning: HOT" on coffee cups. We have now trumped Douglas Adams' toothpick.

Been done. The version at this link... Link Comes with fixed pitch, but can be upgraded to full collective (he's talking about collective pitch on a helicopter blade, not the Borg you Star Trek watching clod.) These things can do wild aerobatics, inverted flight, whatever you want. Putting a GPS receiver on it might be a bit of a challenge, as they will hardly lift anything...I imagine they could carry a grenade, too though.

However, there have also been a number of people who claim I'm overstating the case and that it's not possible to build a real cruise missile without access to sophisticated gear, specialist tools and information not readily available outside the military.

You don't need a *real* cruise missile, you just need a model aircraft. In fact, I've been thinking about getting one (not to build a missile, of course, but just to play with). There are even ones with gas turbines. Hell, do you really need a lot of explosives to terrorize someone/some group? You could even just load a model aircraft up with some colored gas, dump it over a group of people, and probably someone would get trampled to death in the rush to escape. I'm not a chemist, but I'm sure there's a heavier than air colored gas that's nonlethal that can be easily obtained. Even a model helicopter would be fine.

if you look here near the bottom you will find a "Headinglock Module" for the helicopter. What it does is memorizes the last direction the copter was flying in, and in case of interference from wind or something it automatically corrects. This allows you to concentrate more on other aspects of flying.

Ikarus "FUN" Piccolo Micro RC Helicopter
Ikraus Piccolo Micro RC Helicopter
Schweizer 300 Micro Electric RC Helicopter

Ikarus "FUN" Piccolo Micro RC Helicopter
Ikraus Piccolo Micro RC Helicopter
Schweizer 300 Micro Electric RC Helicopter

Ikarus "FUN" Piccolo Micro RC Helicopter
Ikraus Piccolo Micro RC Helicopter
Schweizer 300 Micro Electric RC Helicopter

Take a look at the Piccolo helicopter. A definite flyweight, but bigger than the cars! It is meant for indoor flight.

Compared to the "full size" Raptor helicopter I fly, with its 48" rotor diameter, the Piccolo is tiny. The smaller size and lighter weight of the Piccolo's rotors also means that they store less energy when spinning, so it's possible to crash a Piccolo without completely destroying the rotors every time (my Raptor's heavier rotors turn into toothpicks when it crashes...)

However, don't buy a model heli and expect to be able to fly it straight off, if you don't already know how - it's not as easy as it looks. One of the simulator software packages like RealFlight Deluxe will help you learn to fly and save lots of money in parts (ask me how I know).