to Chinese archaeologists, the area of ​​the rudder was approximately 42.5 m², and the length of the ship to which it belonged was estimated at 149–166 meters. However, such use of this piece of archeological evidence rests upon supposing proportions between the rudder and the length of the ship, which have also been the object of intense contestation: That length was estimated using steel, engine-driven ship as the reference. By comparing the rudder shaft to the Quanzhou ship, Church estimated that the ship was long. Speed The treasure ships were different in size, but not in speed. Under favorable conditions, such as sailing with the winter monsoon from Fujian to Southeast Asia, Zheng He's fleet developed an average speed of about ; on many other segments of his route, a significantly lower average speed was recorded, of the order of . As historians note, these speeds were relatively low by the standards of later European sailing fleets, even in comparison with ship of the line, which were built with an emphasis on armament rather than speed. For example, in 1809, Admiral Nelson's squadron, consisting of 10 ships of the line, crossed the Atlantic Ocean at an average speed of . Replica A copy of a treasure ship was announced in 2006 to be completed in time for the 2008 Olympic Games. However, the copy was still under construction in Nanjing in 2010. A new date of completion was set for 2013; when this dateline failed to be met in 2014, the project was built for 4 years. See also List of world's largest wooden ships Jong (ship), Javanese ship, those used by Majapahit were larger than baochuan Grace Dieu (ship), English flagship of Henry V, about the same size as baochuan Ancient Chinese wooden architecture Pagoda of Fogong Temple Notes References Citations Sources Further reading Traditions and Encounters - A Global Perspective on the Past by Bentley and Ziegler. Ships of China Naval ships of China 15th-century ships Exploration ships Treasure voyages Four-masted ships Six-masted ships Seven-masted ships