China Aviation Industry General Aircraft (CAIGA) is starting construction on the TA-600, the prototype of a giant seaplane that can land and takeoff from water. Once completed in 2015, the TA-600 will have a take off weight of 53.5 tons (6 tons more than the Japanese ShinMaywa US-2, currently the world's largest sea plane) and a range of 5,500km. Its wingspan will be over 40 meters and it will be powered by four turboprop engines. In terms of design, the TA-600 is based off another Chinese design, the 45 ton Harbin SH-5, a mockup of the forward fuselage emerged in January 2014. In historical comparison, the eight-engined Hughes H-4 "Spruce Goose", the largest seaplane ever built, weighed 180 tons in full and had a wingspan of 97 meters.