Guo Changhai presents a model of Chinese Navy vessel made by himself in Rizhao, East China's Shandong province, Sept 11, 2017. The 60-year-old had been a ship captain for 27 years. Fond of making vessel models, he has successfully made two guided missile destroyers, four cruisers and one missile destroyer, which won him fame on internet. [Photo/IC]

Guo Changhai does a simulation experiment of gunfire on a military vessel model at his home in Rizhou, East China's Shandong province, Nov 6, 2013. [Photo/IC]

Aircraft hobbyists Wan Li (center), Gu Chunlin (right) and Huang Aibo (left), pose with the life-size model of the PLA's J-20 stealth fighter aircraft built by themselves at a workshop in Wuhan city, Central China's Hubei province, Sept 10, 2017. According to Wan, they began building the model in June last year and spent 200,000 yuan ($30,612) on it. [Photo/IC]

An aerial view of the life-size model of the J-20 stealth fighter built by the three hobbyists at a workshop in Wuhan city, Central China's Hubei province, Sept 8, 017. [Photo/IC]

One of the homemade electric sports cars "Xing Long 2" built by car enthusiast Chen Yinxi is pictured at the workshop of his family factory in Haikou city, South China's Hainan province, July 12, 2017. He has spent over 5 months in designing and making the car. [Photo/IC]

The homemade electric sports car "Xing Long 1" built by car enthusiast Chen Yinxi is on display during the 2017 Hainan International Automotive Industry Exhibition in Haikou city, South China's Hainan province, July 13, 2017. [Photo/IC]

The homemade electric sports car "Xing Long 1" built by car enthusiast Chen Yinxi is on display during the 2017 Hainan International Automotive Industry Exhibition in Haikou city, South China's Hainan province, July 13, 2017. [Photo/IC]

An F1 racing car undergoes testing on the campus of Changchun University, Northeast China's Jilin province, Sept 12, 2017. Named FCC01, it was built by 38 college students under guidance of three teachers after 10 months of labor. Its top speed is 140 km/h. It's assembled with 1,985 components, 1,700 of which are handmade by the team. The project cost them 500,000 yuan. [Photo/VCG]

Three of the inventors assemble the F1 racing car in Changchun University, Northeast China's Jilin province. [Photo/VCG]

Yan Chaoming rides a swimming dragon on a river in Southwest China's Chongqing, June 10, 2017. Yan conducted 30 tests in five years and spent over 10,000 yuan in making it with recycled plastic. The dragon is 8 meters long and can be controlled via remote control. [Photo/IC]

The dragon made by Yan swims in a river in Southwest China's Chongqing, June 10, 2017. [Photo/IC]