Trek Areospace's OVIWUN UAV uses twin counter-rotating ducted fans built of lightweight materials, dual 450-watt electric motors, a high-efficiency drive train, 14 volt rechargeable battery power system, 3-axis gyro, a low-power PC104-based processor, and open-source flight control software. The vehicle is about 14" tall, weighs a tad over 6 pounds, and is capable of 40+ mph with a maximum hover ceiling of more than 3 miles. Typical battery life is about 20 minutes. It's amazing that $15k can now buy a UAV that would have costs millions only a decade ago.