Er Hu Zhui Yang Jian (二虎追羊箭)

Chinese Twin Engine Incendiary Rocket
Drawing of a Er Hu Zhui Yang Jian, from 'Wu Bei Zhi (《武備志》)'.
Er Hu Zhui Yang Jian (二虎追羊箭, lit. 'Two tigers chasing goat arrow')  is a more sensible rocket design than either Shen Huo Fei Ya (神火飛鴉) or Huo Long Chu Shui (火龍出水). It is a twin-engine incendiary rocket modified from an ordinary arrow. Er Hu Zhui Yang Jian has a unique three-pronged arrowhead, which is usually dipped in poison. An incendiary warhead is attached on the shaft closer to the arrowhead, while two black powder rockets are attached closer to the fletching. The warhead and rockets are connected, probably through a quick match.

 

Unlike the impractical quad-rocket configuration, twin-engine rocket can still achieve stable flight even though both rockets are not ignited at the exact same moment.

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