Balsa wood is a unique material used in modeling

Balsa wood is a unique material used in modeling and physics-based competitions. It has surprisingly high strength, compared to its light weight and low cost. This makes it ideal for school science projects, or home use in model tower building.
Diagram the tower using the grid paper to give you scale: one grid square represents square inch, for example. Start with the base of your structure, making it wide to keep the center of gravity low. Design the exterior structure. If you are competing, don't forget the rules of the competition, but feel free to brainstorm a little. If you are making a model of an existing tower, keep some reference photos handy. When you have a design you like, make diagrams for several angles of the design--at least a front, side and three-quarters-rotation view.
Use the diagram to figure out how forces, like gravity and competition weights, will push or pull on the tower, and imagine how that will stress the various parts of the tower. Add a system of supports to counteract this: most buildings are built in layers with a series of triangular trusses that hold the structure together.
Measure, mark and cut the base pieces for your structure. Miter them if you can, this will give more surface area to glue and make the structure hold together more cleanly. Don't mash the wood as you cut; this will damage the fibers of the wood and make the structure weaker.
Glue the pieces together. Hold them together until the glue is dry.
Measure and cut the next layer of pieces. Glue them onto the base, and hold until dry. Repeat this process until you have built the tower. If you find a weakness while building, add a strut as necessary, but stick to your diagram as much as possible.
Leave the tower to dry overnight. Test it with a light weight, to see if the glue is holding. If the structure has any damage, repair it and find ways to strengthen it.
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