Studies on Rowing Boat for Fisheries―I A canoe from Solomon Is.

摘要

A canoe which was given at Turagi, British Solomon Is., was made by hand with a single wooden trunk showing a common profile around the tropical Pacific. The canoe is 362cm in length, 46.2cm in breadth, 27.1cm in depth and 43kgrms in dry weight. The metacentric height (GM) of it was given as 6.6cm after an inclining experiment in a fish pond and also the height of the gravity center for human body of 168cm tall weighting 70kgrms in rowing aspect was assumed to be 25cm after a test as above. A series of measurements was carried out on the hull body for drawing hull line. And after thickness measurements around the hull, it was found that the thickness was about 5cm above the keel and about 1 to 2cm at the top of the each side. Some calculations and considerations based on the above measurements were made on the static stability of the canoe: i) The metacentric height would be largely affected even by minimal change of the rowing aspect of a paddle man. ii) The righting lever (GZ) would be greatly reduced when only a paddle-man of 70kgrms is on board.