Recently I ran into an old book about Viking ships dug up from burial mounds. It was a small book from the Viking Ship Museum. I don’t know how I got it. It may have come from one of my grandparents or from a book sale. Anyway I scanned a few pages.
These were remarkable finds back in the early 20th Century and greatly increased the knowledge of how the dragon ships went together.
Of course, since then, replica ships have been built using the old techniques and sailed. Sailing a vessel is the only way to understand how it functions and how well it does. You can’t sail an ancient artifact and having a real ship to replicate makes the whole thing possible. Here’s a stack of videos to watch.