|LC Classifications||TA419 .D73|
|The Physical Object|
|Number of Pages||72|
|LC Control Number||53018600|
commercial supply. Its growth is rapid, attaining a size of commercial value in 4 to 6 years. Fast-growing trees between these ages produce the lightest wood, while in slow-growing and older trees the wood becomes heavier and less adaptable to commercial uses. The balsa tested was obtained from a commercial supplier and arrived at. The value reported in the literature falls in the middle of the predicted range. The proposed micromechanical model also accurately calculated elastic properties of balsa wood at the mesolevel. Balsa (Ochroma pyramidale) has remarkable mechanical properties for its weight: for instance, the specific Young's modulus and bending strength are comparable to those of engineering fibre composites. Its high specific shear modulus and strength are widely exploited in the cores of structural sandwich panels in wind turbine rotor by: Balsa wood's distinct properties are directly related to a unique cell structure in the material. The trunk is defined by large pulp cells with thin cell walls. A good comparison for the cells is to imagine the trunk of the tree stuffed with billions of tiny balloons that are all glued together.
Yet despite its softness, Balsa is technically classified as a hardwood, rather than a softwood, since it has broad leaves and is not a conifer. Balsa has excellent sound, heat, and vibration insulating properties, and is also incredibly buoyant: in fact, “Balsa” is the Spanish word for “raft.”. Many of the mechanical properties of wood tabulated in this chapter were derived from extensive sampling and analysis procedures. These properties are represented as the average mechanical properties of the species. Some properties, such Balsa Factors Affecting Wood Properties Natural Characteristics Related to Wood Structure Much of the variation in wood properties within and between trees can be attributed to density. The cell wall substance is actually heavier than water; with a specific gravity of about kgm–3 regardless of species. Each kit contained a 3-view plan, balsa wood cement, 2 bottles of colored dope, a strip of bamboo for wing and landing gear struts, all in all a great value even in those distant days. For several years up to the mid 40's, this initial line of balsa shelf model kits sold well all over the country and, during the time, many more models were.
Balsa is the lightest and softest timber used commercially. It exhibits an unusually high degree of buoyancy and provides very efficient insulation against heat and sound. The wood can be adapted to a great number of special end-uses where these properties are essential. Like with most woods, balsa wood does not have well defined mechanical properties. Its properties vary greatly with the gain direction of the wood and the moisture in the wood. But if one wants to do some design calculations some rough properties are needed. Below is a table of balsa wood properties which I use to do design calculations. Balsa is a very light and low density type of wood. It is very soft, so soft that you can easily dent it with your fingernail and leave a permanent dent. Since it is not very strong by itself, it’s usually sandwiched between some stronger and harder plies or composite layers which gives the . Moreover, balsa wood was used as the original material for the fabrication of wood aerogel due to its low density ( g cm −3), high porosity and thin cell walls  .