YTHS HS  YTHS UAVs are Chinese UAVs developed by Beijing Asian Pacific Hong-Sheng Aviation Science and Technology Co., Ltd. (YTHS, 北京亚太宏升航空科技有限公司) (APHS), which was originally formed as an importer and Chinese distributor of western commercial off-the-shelf (COTS) airframes, flight control systems such as autopilots. YTHS has since expanded its business by developing its own flight control systems and become a system integrator of COTS systems by integrating flight control systems it developed and markets with COTS airframes. HS-12D is an unmanned helicopter developed by APHS in conventional helicopter layout, and the landing gear system consists of a pair of skids. Electrical power produces less noise and enables the unmanned helicopter to fly at higher altitude. HS-15Y is an unmanned helicopter developed by APHS in conventional helicopter layout and the landing gear systems consists of a pair of skids. HS-15Y is the gasoline-powered cousin of HS-12D with longer endurance but lower ceiling. Specification:  HS-32J is an unmanned helicopter developed by APHS in conventional helicopter layout and the landing gear systems consists of a pair of skids. HS-32 series gasoline-powered unmanned helicopters is basically an AF25B airframe integrated with Spanish AX-100 autopilot, and J stand for Jing (警), meaning police, and HS-32 is for law enforcement applications. Specification:  HS-32H is the second member of HS-32 series gasoline-powered unmanned helicopter and H stands for Hangpai (航拍) in Chinese, meaning aerial photography. HS-32H is mainly used for aerial survey/photography and cinematography applications. Most of the parameter of HS-32H is similar to that of HS-32J, except:  HS-32Z is another member of HS-32 series gasoline-powered unmanned helicopter and Z stands for Zhencha (侦察) in Chinese, meaning scout or reconnaissance. HS-32Z is designed for military applications, and has entered service with Chinese law enforcement for forestry/game warden/fire patrols, and disaster relief missions. HS-300 UAV is an unmanned helicopter developed by APHS, which is essentially the Mosquito Aviation XE homebuilt helicopter equipped with AX-100 flight control system indigenously developed by APHS.