I understand that the St. Brendan thing is open to much speculation, especialy without any real hard evidence...

"Dragon ship's", I'm pretty sure is nopt a class of vessle, rather a broad description of the basic design of many of the scandanivian ships... most of their boats, from the big ocean going biggies to the wee paddle boats that helped get them into Russia were all pretty much the same design...

Damned effecient people if ya ask me!