Kuaizhou (KZ, Chinese: 快舟; pinyin: kuàizhōu, meaning "speedy vessel") (also called Feitian Emergency Satellite Launch System, Feitian-1, FT-1) is a family of Chinese "quick-reaction" orbital launch vehicles. Flying since 2013, Kuaizhou 1 and 1A consist of three solid-fueled rocket stages, with a liquid-fueled fourth stage as part of the satellite system. Kuaizhou 11, which flew an unsuccessful maiden flight in July 2020, is a larger model able to launch a 1,500 kilograms (3,300 lb) payload into low Earth orbit. Heavy-lift models KZ-21 and KZ-31 are in development. The Kuaizhou series of rockets is manufactured by ExPace, a subsidiary of China Aerospace Science and Industry Corporation (CASIC), as their commercial launch vehicles.