Changhe Aircraft Industry Group (CAIG) has developed Chinese Z-18F Anti-Submarine Warfare (ASW) Helicopter for People's Liberation Army Navy (PLAN). Z-18F Anti-Submarine Warfare (ASW) Helicopter is based on Z-18 transport helicopter which was designed to replace production line of old Z-8/French SA-321 Super Frelon.
First image of the Chinese Y-8 GX6 Maritime Patrol and Anti-submarine warfare aircraft duing its flight trails. Y-8 GX6 Maritime Patrol and Anti-submarine warfare aircraft is being developed to improve the capabilities of the Peoples Liberation Army Navy in the Anti-submarine warfare.
The Kellett XR-8 (later redesignated XH-8) was a helicopter built in the United States during World War II. It was a two-seat machine intended to demonstrate the feasibility of a twin-rotor system, and while it accomplished this, it also demonstrated a number of problems that prevented further development of this particular design.