A few items in the background of Balsa wood. Balsa wood grows mainly in southern Mexico down through parts of South America. Ecuador is one of the main exporters of Balsa wood. Balsa trees grow very fast, but few that sprout actually survive. Balsa requires direct sunlight to sprout, such as in newly cleared jungles. Balsa trees also require a great deal of water to reach it’s height of 60 to 90 feet.
This water content is one of the most appealing facets of the wood for use in composites and wakesurf boards. When harvested, only about 40% of Balsa is wood, the remainder are the air filled empty water cells. That is 60% of the tree is water, but after harvesting and kiln dried that water is gone and what’s left is air.
Balsa wood doesn’t have a consistent density, contest grade balsa, like what we will use for this wakesurf board, ranges from 4 to 6 pounds per cubic foot, but much heavier densities up to 12 pounds per cubic foot are available.
Balsa wood isn’t the lightest wood available for composite construction, but it’s strength to weight ratio is superior of all light woods, plus Balsa has tremendous reflex properties, allow it to store and release energy. These characteristics make it an excellent choice for the skin of a composite sandwich.
It’s said that Balsa gets it’s name from the Spanish Conquistadors who observed the Inca’s using rafts made of the wood to float their warriors, Balsa means raft in Spanish.
Balsa has been used in composite boats for years. End Grain Balsa in particular offers light weight and rugged construction for large yahct manufacturers seeking the best material for their vessels. In the picture below, a yacht being built inside a mold and the end grain balsa sandwich applied.
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