The Dashao （lit. "big siyah"） bow was recored as a new design military bow used by the border army of the Ming Empire. The earliest mention of this bow dates to the year 1606, and it is said to already replaced the kaiyuan bow by then.  The same source also gives the bow's size as "three and a half chi core, plus one chi of siyah". This, minors the possible inserted parts of the siyah, resulting in a big bow, about 160cm alone its curve.
 
However the earliest clear depiction of the bow only comes in Gao Ying's 1637 work Wu Jing She Xue Zheng Zong (The Orthodox Canon of Archery in Military Classics), in which it clearly written the bow has a straight, non-recurved siyah.

So we recreated the Dashao based on these information. The result is a decent heavy arrow shooting bow. The straight, non-recurved siyah while providing enough leverage, also gives extra stability to the bow.
 
-Bow length: 165cm
-Draw length: up to 35’’
-Length of string:  approx. 153cm 
-Draw Weight: 30 to 90lbs (measure at 33'', NOT 28")
-Minimum Arrow Weight:
For target shooting: 15 gpp if your draw length is more than 33",  12 gpp if you draw less than 32" 
 
For Combat (hopefully you won't have to): 20 gpp or more
 
Price Options
Synthetic Bark +$20
More than 60lbs +$20
More than 70lbs +$40
More than 80lbs +$60
 
*Draw length estimation: 100% full draw=half of arm span minors 1" to 2"
**Please unstring the bow if not in use, or it may loose draw weight.