As lumber was used up, it became harder to make wood work boats, so the builders had to become savvy and work with what they could get their hands on, as plywood (especially marine) had not yet been invented. These ended up with engineered sips that could be easily repaired. I recently read a story of a dug out of wood boat converted to a sailing vessel, it was around 60' feet long, 100 years after it had been made from a single early growth tree, and was sailed 33,000 miles!!. That boat lasted around 200 years total. If around today, it would have been able to have been repaired, what a piece of history. The oldest dug put still in existence, archaeologically, is 8000 years old!! The Mufunu canoe of Northern Nigeria, China has one around the same age they have discovered..
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