Then, the question was about how to make fittings, and of what material. We saw bamboo sticks: they were thin enough to not affect the aerodynamics, had sufficient flexibility and were quite strong. (Elements of guard fasteners to the body)ĭuring the design process, the question arose about a lightweight and strong material to be used for the guard. In the progress of designing, we faced problems in modeling corner joints, but they were solved by simplifying the design, and the differences of the angles were compensated for by flexible materials. Making simple calculations for the required size, we built a model in Inventor CAD. First modelsĪ specification has been prepared for the ease of monitoring the manufacturing process, and we started modeling. They are of two types as well: with five faces on the vertex (five beams protrude from the vertex) and with six faces (six rays protrude from the vertex). The corner joints (fittings) were not very easy either. For better understanding, I will insert all necessary formulas from Wikipedia below. In creating such a shape, two types of edges (beams) are used: short and long ones, their length is calculated based on the desired diameter of a polyhedron inscribed into a sphere. In addition, such a guard is easily scalable to the desired size. It was decided to make the guard in the shape of a semiregular polyhedron (examples include fullerene, carbon, or a pentakis dodecahedron) - it was chosen as the most pleasing to the eye. DevelopmentĪs a result of searching for a solution that would fit all our requirements, we ended with several similar options. ![]() We made a difficult decision: we had to make it entirely ourselves and almost from scratch, and the goal was to make it lightweight and easy to manufacture. In general, guard either did not protect the copter fully or looked awkward and was too scarcely available. For example, propeller guard protects the propellers themselves quite well, but upon the slightest touch upon an obstacle the copter would flip over and fall down. ![]() Unfortunately, searching the Internet did not provide a sufficiently simple and, more importantly, cheap solution for ordinary users. Such situations are even more unpleasant for a beginner who cannot avoid an obstacle and is just learning to fly.Īll this made us search for a solution. ![]() Such "crash tests" are not very pleasant, and in the best case may cause losing a considerable sum on repairs, and in the worst case - in losing the copter. Flying even in a relatively large space is associated with the risk of hitting an obstacle: there might be a tree or a building in the path of the copter, to say nothing about flying in confined spaces. Such flights are associated with considerable risk of damaging the copter upon hitting walls and various items. Probably, everyone who has held a copter has had to fly it indoors.
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