美国卡曼公司根据它与美国海军研究局的合同,研制并试验了一种“舰载系留飞行平台”(STAPL)。 1970年,按合同要求完成了系统的初步设计,接着制造了两架样机(第二架在第一架的基础上作了改进)。1974年,两架样机开始进行样机、样机的机动起飞、回收平台以及控制系统的非飞行性试验。这些试验一直进行到1975年才结束。1977年进行了首次飞行试验。样机有自动陀螺装置、自动数据记录设备和独立工作的自动飞行控制系统。飞行控制系统能在三个轴向对飞行器进行稳定控制,并能自动控制飞行器的飞行轨道。为了可靠地工作,进行多路重复的控制。飞行器的推进螺桨用一辅助电动机带动。有效负荷约为22.7公斤(50磅)。 Based on its contract with the U.S. Naval Research Agency, the U.S. Cayman Company developed and tested a “Shipborne Tethered Flight Platform” (STAPL). In 1970, the initial design of the system was completed as required by the contract, followed by the manufacture of two prototypes (the second one was improved on the first one). In 1974, two prototypes began prototypes, prototype takeoffs, recovery platforms and control systems for non-flight tests. These tests have not been completed until 1975. The first flight test was conducted in 1977. Prototype automatic gyro devices, automatic data recording equipment and independent work of the automatic flight control system. The flight control system can stably control the aircraft in three axial directions and can automatically control the flight path of the aircraft. To work reliably, multiple repetitive controls are performed. The propulsion propeller of the aircraft is driven by an auxiliary motor. The payload is about 22.7 kilograms (50 pounds).