Editing Norfolk wherry (section)

==Development of the wherry==
[[Wherry|Wherries]] were  sail and [[oar]] craft dating back to at least 1604.  These were small craft, in 1727 being of 8 tons net [[tonnage]].  They were still sail and oar boats, fitted with hoops and canvas [[:wiktionary:tilt#Etymology 2|tilts]] for the comfort of their passengers.  They would have provided a service carrying passengers and small perishable cargoes.  Alongside these early wherries were the bigger [[Keelboat#Historical keel-boats|keels]], which were [[Transom (nautical)|transom-sterned]] [[Clinker (boat building)|clinker-built]] barges with a square sail on a mast stepped amidships of about {{convert|54|ft}} by {{convert|14|ft}} and able to carry 30 tons of goods. The keel had been built since the [[Middle Ages]] and the design probably went back to the [[Viking expansion|Viking invasion]].<ref>{{cite journal |jstor=26057665 |language=en |title=The Viking Longship |journal=Scientific American |volume=278 |issue=2 |pages=56–63 |last1=Hale|first1=John R. |year=1998 |doi=10.1038/scientificamerican0298-56 |bibcode=1998SciAm.278b..56H}}</ref><ref>{{Cite book |url=https://books.google.com/books?id=_TD-AQAAQBAJ&q=keel++Viking+invasion |title=The Vikings in History |last=Logan|first=F. Donald |date=2013-11-05 |publisher=Routledge |isbn=9781136527166 |language=en}}</ref> After 1800, the Norfolk Keel (or 'keel wherry') disappeared, partly because a wherry could be sailed with fewer crew, and it had limited manoeuvrability and lacked speed.<ref>{{cite book |last=Clark|first=Roy |title=Black-sailed traders: the keels and wherries of Norfolk and Suffolk |year=1961 |publisher=Putnam |location=London |oclc=12426898}}</ref>