The main efficiency boost is using a helicopter style rotor over a quadrocopter - the larger propeller means greater efficiency. Obviously a great deal of time

The main efficiency boost is using a helicopter style rotor over a quadrocopter - the larger propeller means greater efficiency. Obviously a great deal of time is spent on weight reduction. And finally the max range is one direction, until the battery is completely dead. When you have military funding there's no need for a return trip... and to think each of these could send a kid to college.