Thor Heyerdahl completed this voyage, didn't he? The Rah Expedition?
I'm not sure what Heyerdahl did but this is what I found at www.greatdreams.com/thor.htm about the "Rah Expedition":
Thor Heyerdahl continued his research on ancienct navigation and turned his attention to the ancient reed-boats made of papyrus. These boats were deemed insufficient to cross the Atlantic as the reeds were believed to become water-logged after less than two weeks on open water. Heyerdahl believed that contemporary science underestimated the the ancient vessels and undertook to prove this by experiment. In 1969, he bought 12 tons of papyrus and worked with experts to construct an ancient-style vessel. The result was a 15 m boat which was launched at the old Phoenician port of Safi, Morocco. In the spirit of cooperation, Heyerdahl embarked under the UN flag with a crew of seven men from seven countries. The papyrus craft, Ra, sailed 5000 km (2700 nautical miles) in 56 days until storms and deficiencies in the construction caused the team to abandon their target only one week short of Barbados.It doesn't have much more in common with whatever the Polynesians might have done than be an ocean voyage in a small craft. Whatever Heyerdahl pretended, he knew what was out there and knew what sort of provisions were required. But at least on his first venture all he got was an A for effort. If he were really an ancient, he would have died.Ten months later, Heyerdahl tried the same voyage with the smaller (12 meter) Ra II. This vessel crossed the widest part of the Atlantic 6100 km (3270 nautical miles) in 57 days, from Safi to Barbados. Once again, this voyage showed that modern science under-estimated long-forgotten aboriginal technologies. The theory that Mediterranean vessels built prior to Columbus could not have crossed the Atlantic was thrown on its head.
In subsequent years, Heyerdahl continued on many other expeditions, including the Tigris river (1977) and the Maldives Islands (1982, 83 and 84). Now in his eighties, Heyerdahl remains an active participant in archaeological expeditions, as well as an international promoter of cooperation and understanding between peoples across the globe.
ML/NJ