Po Chuan Fa (破船筏)

Drawing of a Po Chuan Fa, from 'Wu Bei Zhi (《武備志》)'.

Po Chuan Fa (破船筏, lit. 'Ship-breaking raft'), also known as Po Chuan Ge (破船舸, lit. 'Ship-breaking barge') was a simple yet effective anti-ship weapon designed for coastal and riverine warfare. It was essentially a heavy log raft assembled from five full-sized, three zhang long tree trunks, waterproofed with tung oil, caulked with putty and hemp, and installed with four to six paddle wheels. For armaments, three Po Zhou Chong (破舟銃, lit. 'Ship-breaking gun') which were essentially oversized Shen Qiang (神鎗) loaded with spear-sized steel darts, were mounted at the bow of the raft. A fully enclosed crew compartment was also built on the raft to allow the crews to operate the guns and paddle wheels in relative safety.

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Interesting comparison between different warships of the Far East in the sixteenth and seventeenth century

I came across this interesting comparison at Baidu Tieba, although the original post has since been deleted. The original comparison is a simple table written entirely in Chinese, so I translated the table to English and added a few commentaries.

Weight of Cannon (lbs)*	<500	500	1000	1500	2000	3000	4000>
Sixteenth Century Portuguese Galley	34+
Ming Dynasty Feng Zhou (early)	30+
Ming Dynasty Feng Zhou (late)	14+
Mark 1 Warship of Qi Ji Guang's fleet (early)	9+	1
Mark 1 Warship of Qi Ji Guang's fleet (late)	14+		2
Tekkōsen	48 – 70	3
Geobukseon**	20 – 30+
Advanced Ming Dynasty War Junk	30+	14 – 22				6 – 8
Koxinga-era Gong Chuan	100 – 200+	20+					1
Dutch Hired Vessel 'Graaf Hendrik'	?	?	8	10	8	8	2
Mông Đồng							1 – 2

* Although weight of shot is a more reliable measure of firepower, Chinese records seldom mention them. Chinese gunners also frequently loaded their guns with multiple smaller shots in addition to the main shot (which made them less powerful), making measurement purely by weight of shot very misleading.

** This assume a late variant of Geobukseon/Turtle ship with significantly improved armaments, due to the fact that very little is known about the early, Imjin War-era Geobukseon.

Feng Zhou (封舟, lit. 'Investiture ship')

A Qing Dynasty Feng Zhou, from 'Ce Feng Liu Qiu Tu (《冊封琉球圖》)'.

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