Re: Full or fin keel?
Jack, the basic hull design of a longboat hull would be great if we could lower the CG with external ballast what obviously could not be done at that time. The boat evolution in what regards sailboats went in the sense of increasing draft as a way to lower CG (the lower bottom of the ships were loaded with stones).
The type of hull of the longboats was not adapted to that, it had a good load capacity but would not go very deep on the water, not allowing the CG to go down substantially.
I agree that the Viking longboats were an amazing design and one that remained at the top for several hundreds of years and that is amazing.