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The legend of Wan Hu was not recorded in any Chinese history book. The earliest known mention of it is an unreferenced description in Rockets and Jets by American author Herbert S. Zim in 1945.
"Early in the sixteenth century, Wan decided to take advantage of China's advanced rocket and fireworks technology to launch himself into outer space. He supposedly had a chair built with forty-seven rockets attached. On the day of lift-off, Wan, splendidly attired, climbed into his rocket chair and forty seven servants lit the fuses and then hastily ran for cover. There was a huge explosion. When the smoke cleared, Wan and the chair were gone, and was said never to have been seen again."
The legend was then introduced into China via translation, and that is why the exact Chinese name that this legendary person had (è¬è™Ž or è¬æˆ¶) as mentioned above could not be determined just based on the pronunciation.
The story is more of an urban legend invented in the 20th century rather than part of Chinese historical records.
Another legend describes a sled-like vehicle with many kites attached.