4. MQ-9 Reaper
The MQ-9 Reaper is a multi-purpose drone that has been manufactured in the United States and designed for longer and high-altitude missions. It measures 11 meters in length and 20 in wingspan and has a maximum takeoff weight of 4.7 tonnes and a payload capacity of 1.7 tonnes. This drone is powered by one engine with 900 horsepower and can reach a speed of more than 450 km per hour. It can fly at an altitude of 15000 m and has a range of 27 hours. The MQ-9 is currently in service with the United States Air Force, the Italian Air Force, and the Spanish Air Force.