What is the first helicopter developed by China with independent intellectual property rights?

Zhi 1 1 Helicopter is a light multipurpose military-civilian helicopter jointly developed by Changhe Aircraft Industry Corporation and China Helicopter Research and Development Institute. It is the first helicopter model in China from patent production, mapping imitation to independent design, the first model with independent intellectual property rights, and the first model in China to introduce full airworthiness management and evidence collection. Zhi 1 1 is a light multipurpose helicopter with 2 tons and 6 seats. The general layout adopts conventional helicopter mode, main rotor and tail rotor layout. At the end of 2002, the aircraft successfully completed the civil airworthiness test flight on the Qinghai-Tibet Plateau, many of which were internationally recognized helicopter-related risk subjects. Eight aspects, such as air start test of single-engine helicopter and helicopter autorotation landing test, have filled the gap in the field of helicopter flight test in China and achieved a major breakthrough in the flight history of domestic helicopters. Straight 1 1 also broke many national records in the history of helicopter flight in China. At present, it is the helicopter with the highest attendance rate in China: as of February 30, 2005, the Z 1 1 fleet delivered to users has accumulated 230,000 landing gears, exceeding 40,000 hours, and the safety of straight 1 1 is excellent, so far no safety accident has occurred. In the cold test flight in 2000 1 month, it created many firsts in the history of helicopter flight in China: flying in the air for more than 5 hours; The battery life is 2 hours at -38℃; One-day transition flight for 8 hours and 33 minutes, crossing the temperature difference of 5℃ to -38℃, flying 1332 km without any fault; For two consecutive days, it flew 2470 kilometers and crossed seven provinces without any difficulty. Each performance index has reached the advanced level of similar helicopters in the world. The model is Zhi 1 1, which is the "competitive machine" with the lowest cost, the shortest development time and the best performance in China. According to the needs of national defense construction and domestic civil aircraft market, Zhi 1 1 has been continuously improved, and now it has developed into Zhi1/j, Zhi1/w, Zhi11.