Model Radio Control Transmitters
Is it possible to build a rc model plane that can fly up to 2-3 hours at high alt.?
Is it possible to build a rc plane that can fly 2-3 hours (gas or electric?) and program it’s flight using gps so you don’t have to worry about radio range. It would fly around 2000-4000ft. I want this to be like a survallence plane with a few cameras with monitors on the ground and a remote to control the cameras. What is the longest radio range for an rc transmitter and reciever?
Yep! Totally possible. CHeck out DIYDrones.com, they have a lot of information there on building UAVs (Unmanned Aerial Vehicles) that have GPS, accelerometers, gyroscopes, etc.
One issue is that its very difficult to fly at 2k-5k feet because you can’t see the plane at that height! You probably will have some trouble keeping radio contact with it too for your video system. Also, flying to that height takes a LOT of power, especially if you want to fly for 2-3 hours. Most electric planes only fly for 15-30 minutes. Sail planes can do an hour if you fly thermals, but there isn’t anyone I know of who has automated it.
I’m actually working on one right now that will have a wifi radio link and solar panels. The onboard computer will take care of most flying and will allow GPS waypoints, the wifi will transmit video and GPS location and other stats, as well as allow control. Solar is used so that I can have much longer flights, which will hopefully make me able to clime to 30k feet. 
It gets expensive though… the full diydrones computer system with accelerometers, gyros, and then getting GPS, programmer, etc, will set you back about $500. Plus you need a plane, radio, etc.
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