Unique weapon of the Ming Dynasty — Fei Kong Ji Zei Zhen Tian Lei Pao (飛空擊賊震天雷砲)

Flying Bandit-Hitting Skyshaker Thunderbomb
Drawing of a Fei Kong Ji Zei Zhen Tian Lei Pao, from 'Wu Bei Zhi (《武備志》)'.

Fei Kong Ji Zei Zhen Tian Lei Pao (飛空擊賊震天雷砲, lit. 'Flying skyshaker thunderbomb of traitor-attacking'), also known as Zhen Tian Fei Pao (震天飛砲, lit. 'Sky shaking flying bomb') is a unique ball-shaped explosive rocket. Like the Shen Huo Fei Ya (神火飛鴉), this weapon is assembled from three parts: A ball-shaped warhead made of bamboo strips, a cylindrical rocket made of paper that is inserted into the warhead, as well as two paper wings. The warhead is big enough to be filled with explosive, incendiary, smoke and poisoned fragmentation gunpowders at the same time. Because of its unaerodynamic shape, this weapon has limited range. Launching the weapon from a upwind position can increase range.

Incidentally, this is not the first weapon to bear the name of Zhen Tian Lei (震天雷, lit. 'Skyshaker thunderbomb'). The original Zhen Tian Lei is a type of trebuchet-launched cast iron bomb developed by the Jurchen of the Jin Dynasty in their war against the Mongols.

Another version of Zhen Tian Lei, this time used by the Mongols against the Jurchen, is possibly launched from a cannon.

The Koreans of the Joseon Dynasty also had their own version of Zhen Tian Lei called bijincheonloe (비진천뢰 or 飛震天雷, lit. 'Flying skyshaker thunderbomb') or bigyeok jincheonroe (비격진천뢰 or 飛擊震天雷, lit. 'Skyshaker thunderbomb of flying attack'). It is a cast iron delay-action shell that can be launched from a bombard or mortar. This weapon can be considered an early forerunner of time bomb.

飛擊震天雷
Joseon Dynasty bijincheonroe, from 'Yungwon pilbi (《융원필비》 or 《戎垣必備》)'.

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