When it comes to flight, weight is everything.
The less weight you’re trying to get airborne the easier it is to start and maintain flight. Nature knows this, which is one of the reasons that birds have hollow bones.

When it comes to airplanes the same rules apply Wood, canvas, aluminium and now light composite materials all improve flight dynamics and improves energy efficiency. Modern electric UAVs are only possible because battery energy density has reached the point where the power-to-weight ratio is practical. It’s still a long way off from the energy density of gas, but good enough for 30- minute missions.

Of course, we don’t just want these craft to fly. We want them to do things that are useful in flight. That’s what we call the payload of an aircraft. The spare capacity it has to carry objects that are not strictly needed for flight itself. In the case of camera drones that payload is obviously a camera, but people are coming up with new jobs for drones all the time. Unfortunately most drones don’t have much power to spare for lifting anything but themselves.

The drones we’re looking at in this article are not like most drones. They’ve been built to push the limit between lift-capacity and electric drone design. In order to operate a drone for any business purposes (to make money) in the United States you will need a license.This is called a Remote Pilot Certificate.