美国国防部高级研究计划局开发出了世界上最快的四轴无人机，时速达到了45英里，也就是20米/s。 他们研发了一种轻量级快速自动程序（Fast Lightweight Autonomy program...
America's defence advanced research projects agency (darpa) developed by unmanned aerial vehicle (uav), the world's fastest four axis reached 45 miles per hour, which is 20 m/s. They developed a Lightweight Fast automatic program (Fast Lightweight Autonomy program...
